feat: deprecate @langchain/community google cal tools

[priley86]

Deprecates usage of the lesser maintained @langchain/community/tools/google_calendar, which are currently causing issues w/ the zod schemas supported by the OpenAI LLM models references here (zod schemas here have become dated & do not include .nullable() with .optional() fields).

error when this tool is currently used:

intercept-console-error.ts:41 StreamError: Zod field at `#/definitions/extract/properties/search_query` uses `.optional()` without `.nullable()` which is not supported by the API. See: https://platform.openai.com/docs/guides/structured-outputs?api-mode=responses#all-fields-must-be-required
  at consumeStream (stream.js:453:35)
  at async Object.submit (stream.js:555:9)

We've made a similar update already in here and in auth0-ai-samples.

Tested the inline view and create google cal tools introduced here to work as expected now.

Screenshots:
View:

Create:

[deepu105]

this looks weird as we dont do this for any other imports, any reason for this?