docs: add documentation for cache.batch method (#12990)

[bas0N]

docs: add documentation for cache.batch method

Fixes #12990

Adds comprehensive documentation for the cache.batch method:

• JSDoc (src/cache/core/cache.ts) - Added doc block with description, examples, and parameter docs
• Guide (docs/source/caching/cache-interaction.mdx) - New section covering usage, optimistic updates, and onWatchUpdated
• API Reference (docs/source/api/cache/InMemoryCache.mdx) - Full API docs with options table and signature

[apollo-cla]

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[changeset-bot]

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Latest commit: c1f3997

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