feat: batch connector bigquery support

[tabVersion]

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as replacement for #22744

following #23024

pending item:

• base64 support for auth json feat(sink): support bigquery credentials with base64 #23100

What's changed and what's your intention?

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• I have checked the Release Timeline and Currently Supported Versions to determine which release branches I need to cherry-pick this PR into.

Documentation

• My PR needs documentation updates.

Release note

[Copilot]

Pull Request Overview

This PR adds support for BigQuery as a batch connector in RisingWave, allowing users to create sources that read data from BigQuery tables. The implementation follows the existing batch source pattern and includes schema inference capabilities.

Key changes:

• Implements a new batch_bigquery connector with split enumeration and reading capabilities
• Adds BigQuery schema extraction and type mapping functionality
• Integrates the new connector into the existing batch source infrastructure

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/sqlparser/src/ast/statement.rs	Adds format validation for bigquery connectors
src/frontend/src/handler/create_source/validate.rs	Registers bigquery connector format compatibility
src/frontend/src/handler/create_source/external_schema/bigquery.rs	Implements BigQuery schema extraction for source creation
src/frontend/src/handler/create_source/external_schema.rs	Integrates BigQuery schema extraction into the external schema handler
src/connector/src/with_options.rs	Adds helper methods to identify BigQuery connectors
src/connector/src/source/mod.rs	Exports BigQuery batch connector components
src/connector/src/source/big_query_batch.rs	Core BigQuery batch source implementation with split enumeration and reading
src/connector/src/source/batch.rs	Integrates BigQuery splits into the batch source framework
src/connector/src/source/base.rs	Adds BigQuery split conversion support
src/connector/src/sink/big_query.rs	Refactors and adds shared BigQuery utilities for type mapping and schema operations
src/connector/src/macros.rs	Registers BigQuery batch source in the macro-generated source classifications

[Copilot]

Import anyhow macro consistently. Use either use anyhow::anyhow; or use anyhow::{Context, anyhow}; but avoid mixing both patterns in the same import statement.

Suggested change

	use anyhow::{Context, anyhow};
	use anyhow::Context;
	use anyhow::anyhow;

[Copilot]

Consider defining this split ID as a constant to avoid magic strings and improve maintainability across the codebase.

[Copilot]

This double serialization/deserialization (to_value then from_value) is inefficient. Consider using serde_json::from_str with the original JSON or implementing a direct conversion from BTreeMap.

[Copilot]

The error handling logic for base64 decoding and JSON parsing is duplicated between build_client and build_writer_client. Consider extracting this into a helper method to reduce code duplication.

[graphite-app]

Looks like this PR extends new SQL syntax or updates existing ones. Make sure that:

• Test cases about the new/updated syntax are added in src/sqlparser/tests/testdata. Especially, double check the formatted_sql is still a valid SQL #20713
• The meaning of each enum variant is documented in PR description. Additionally, document what it means when each optional clause is omitted.