docs: Update `SearchDocumentChunksRequest.page_size` comment to reflect new maximum limit of 100 and coercion behavior
docs: Update `SearchDocumentChunksRequest.filter` comment to document `content_length_bytes` filtering
docs: Fix formatting in `BatchGetDocumentsRequest.names` comment
feat: add AnswerQuery RPC to v1
The AnswerQuery RPC is now generally available in the v1 API. This method allows clients to submit queries and receive answers grounded in the Developer Knowledge corpus.
PiperOrigin-RevId: 949549664