google-genai breaking changes

[Interactions] Breaking change for Interactions, rename ContentDelta unions. ([1b03909](https://github.com/googleapis/python-genai/commit/1b03909ac8367205a2f0dd46847a0f6d36fb62fd))

Enable server side MCP and disable all other AFC when server side MCP is configured. ([4dd7b16](https://github.com/googleapis/python-genai/commit/4dd7b165dc54d3ae75367f68d05f9d9951688f54))

Support more image sizes and resolutions ([8b2a4e0](https://github.com/googleapis/python-genai/commit/8b2a4e04707c86e5f7d46e0483a88457fbf6d533))

Change interactions media mime type to enum (breaking change for experimental feature) ([e0f3378](https://github.com/googleapis/python-genai/commit/e0f33786f76a1af6ac3ad1938ab57961833bf0a1))

Handle non-list response_stream in HttpResponse.json property ([006042d](https://github.com/googleapis/python-genai/commit/006042db8379d957ac1ac0e57993983a21f7e1d1))

Handle non-list response_stream in HttpResponse.json property ([#1903](https://github.com/googleapis/python-genai/issues/1903)) ([61aec34](https://github.com/googleapis/python-genai/commit/61aec3455e886a1c700fb0ba21ed40f59bba65ff))

Make aiohttp an optional dependency, bump aiohttp version upperbound, and ensure HttpOptions.async_client_args propagates to custom aiohttp.ClientSession request args for proxy etc. ([b28d144](https://github.com/googleapis/python-genai/commit/b28d1445bb6c2c46c495ffd1b03a622d9d6942f6)), closes [#2090](https://github.com/googleapis/python-genai/issues/2090) [#2051](https://github.com/googleapis/python-genai/issues/2051) [#1950](https://github.com/googleapis/python-genai/issues/1950)

Update README and codegen_instructions for structured outputs ([4d5a978](https://github.com/googleapis/python-genai/commit/4d5a978932e9aacd2569f3058ce5af527ae18210))

Regenerate docs for 1.64.0 ([a023141](https://github.com/googleapis/python-genai/commit/a02314197d0dc72e854fa3ea79247f53421511ba))

Add gemini-3.1-pro-preview to list of models in Interactions ([fe86870](https://github.com/googleapis/python-genai/commit/fe86870752ca8cc66d140d3942e9b07f19ca092c))

Add Image Grounding support to GoogleSearch tool ([0035182](https://github.com/googleapis/python-genai/commit/0035182ec4eaf1ce2503a09f290b1e48a2e1ee1f))

Use pytest-xdist for test parallelization ([6ff82fc](https://github.com/googleapis/python-genai/commit/6ff82fca9ed90992c15cfb3affdbb65dd5d5f4d1))

Add missing fields to the model types ([4b855e6](https://github.com/googleapis/python-genai/commit/4b855e621525f2bdd7cdd00e3a98edbdd173997b))

Don't generate warnings from response.text property because of thought_signature. ([dd9360d](https://github.com/googleapis/python-genai/commit/dd9360d21d0a979ddd7acf994a0aa19bec794182))

Fix base_steps parameter for recontext_image ([d94077b](https://github.com/googleapis/python-genai/commit/d94077bdeeddf012eae8134a341c915be5fe24ce))

Fix file_search_stores.documents pagination ([8d40d48](https://github.com/googleapis/python-genai/commit/8d40d48d9a048313ec97b60a8941e7b536721d6e))

Fix models.list() filter parameter ([7fa1e41](https://github.com/googleapis/python-genai/commit/7fa1e41580052822c90d9b6ba99c66674ab5851a))

Handle SSE error message types properly in streaming ([72afa50](https://github.com/googleapis/python-genai/commit/72afa50eb2c4d960a4f6b55909205d0739fde05a))

Roll back a breaking change to the import system ([8674003](https://github.com/googleapis/python-genai/commit/86740033fb9c93b822b33100324f6c2ac8ad1f7e))

Log Schema.json_schema and Schema.from_json_schema only once ([517300c](https://github.com/googleapis/python-genai/commit/517300caabd58268f06f4091f0cbbb52c2bc889e))

Regenerate docs for 1.49.0 ([74b680a](https://github.com/googleapis/python-genai/commit/74b680adfdf74b6e807d50d8595f092cd522a6f8))

Ignore struct types when performing forward compatibility field filtering ([7024011](https://github.com/googleapis/python-genai/commit/702401102a34e21e94201c9cc48aa7fe2db68958))

Adding `thought_signature` field to the `Part` to store the signature for thoughts. ([303f906](https://github.com/googleapis/python-genai/commit/303f9069f508e544fe2f9c680a700624057b6341))

Include UNEXPECTED_TOOL_CALL enum value to FinishReason for Vertex AI APIs. ([ccbc66e](https://github.com/googleapis/python-genai/commit/ccbc66e199b23cecf3a4bd0680c6a52b1260cedb))

Support ephemeral auth tokens as API keys for live connections in Python. ([db1d7ee](https://github.com/googleapis/python-genai/commit/db1d7eec869525d41ffc7b1570bd597b12fab323))

Removed `live_ephemeral_connect`, ephemeral auth tokens can now be used as API keys ([db1d7ee](https://github.com/googleapis/python-genai/commit/db1d7eec869525d41ffc7b1570bd597b12fab323))

Rename LiveEphemeralParameters to LiveConnectConstraints. ([6719faf](https://github.com/googleapis/python-genai/commit/6719faf6be905b192397cfc361283f2bb9cad8de))

Send automatic function calling None responses as NULL to the model ([8446e3d](https://github.com/googleapis/python-genai/commit/8446e3deb514fd0bbc929d8dc8bcf79264bc0b45))

Support API keys for live in VertexAI mode ([5b5a750](https://github.com/googleapis/python-genai/commit/5b5a750fb25a2cdece16ca4027364ff0c9a591ef))

Support new fields in FileData, GenerationConfig, GroundingChunkRetrievedContext, RetrievalConfig, Schema, TuningJob, VertexAISearch, ([b07c549](https://github.com/googleapis/python-genai/commit/b07c549fa0d380629e5e25956291cb0693b23c94))

Add generate_audio field for private testing of video generation ([c2bccf3](https://github.com/googleapis/python-genai/commit/c2bccf373806be03c4e69973df8157dba6a2d0dc))

Fix comment typo for Modality.AUDIO ([d16cf1e](https://github.com/googleapis/python-genai/commit/d16cf1e9b1c2d210b911d3b3f7da5da891148c39)), closes [#620](https://github.com/googleapis/python-genai/issues/620)

Fix README typo. ([59ae8e0](https://github.com/googleapis/python-genai/commit/59ae8e0d18449b4eba109cfc5697d62b149eda6d))

Remove unsupported Lyria enum for music generation mode ([98ff507](https://github.com/googleapis/python-genai/commit/98ff507d368d48066c701256c60718b620b098e2))

Remove unsupported Lyria enum for music generation mode

remove Part.from_video_metadata

Remove deprecated field: `deprecated_response_payload`

Rename files.upload argument to "file" instead of "path".

make Part, FunctionDeclaration, Image, and GenerateContentResponse classmethods argument keyword only

Moved the HttpOptions class into types.py, by making it autogenerated. This causes the following breaking change:

Change asynchronous streaming output to an awaitable async iterator for client.aio.models.generate_content_stream and client.aio.chat.send_message_stream

Remove skip_project_and_location_in_path from HttpOption

Remove skip_project_and_location_in_path from async models.list

remove "tuning.distill"

Remove pillow as a required dependency

Renamed FunctionDeclaration class functions to reflect the fact that they work off of the `Callable` type not just functions.

rename batches.list method signature.

rename generate_image() to generate_images(), rename GenerateImageConfig to GenerateImagesConfig, rename GenerateImageResponse to GenerateImagesResponse, rename GenerateImageParameters to GenerateImagesParameters

Make Imagen upscale_factor a required argument, make upscale config optional

contents must be passed to CreateCachedContentConfig instead as a parameter to create_cached_content.