google-common [major] / google-webauth [minor] / google-gauth [minor]: Gemini functions

[afirstenberg]

Adds support for function calling through langchain tools.
Adds support for bind().
Adjust testing, since AI Studio has gotten more strict.

Tested with AI Studio and Vertex AI. (Note this does not change the google-genai package.)

Missing:

• Support for withStructuredOutput() (@jacoblee93 says he will handle)
• Documentation

Fixes #4253

New exports:

@langchain/google-*/{types,utils}

• I opted to export from separate entrypoints because if I exported all types/utils from the root entrypoint of common then we would be stuck with two bad options:

1. individually import & re-export modules inside packages like gauth/vertexai, etc so we aren't also exporting all the base classes from common. This means we will also need to remember to update the exports & cut releases for all these packages when a new type/util is added that we want to export.
2. re-export everything, including base classes. This would confuse users as they'd see ChatGoogle, ChatVertexAI, etc, etc in IDE autocompletes when looking at exports from, for example @langchain/google-vertexai

• Added a new util zodToGeminiParameters since the google function definition does not cleanly allow for passing the result of zodToJsonSchema into the parameters field of a function.

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Name	Status	Preview	Comments	Updated (UTC)
langchainjs-api-refs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 27, 2024 4:08pm
langchainjs-docs	✅ Ready (Inspect)	Visit Preview		Mar 27, 2024 4:08pm

[dosubot]

Hey there! 👋 I noticed that this PR adds new dependencies to the "dependencies" section, which might impact the project's peer/dev/hard dependencies. I've flagged this for the maintainers to review. Keep up the great work!

[jacoblee93]

Thanks both of you! Mostly nits, and looks like build is also failing.

d