Add BIGQUERY client-side statement

[apstndb]

Summary

• Add BIGQUERY <sql> client-side statement for executing BigQuery SQL from spanner-mycli (works in batch mode and detached mode)
• Add CLI_BIGQUERY_PROJECT, CLI_BIGQUERY_LOCATION, and CLI_BIGQUERY_MAX_BYTES_BILLED system variables
• Use BigQuery-specific auth options (credential/ADCPlus/impersonation shared with Spanner, but no emulator endpoint or WithoutAuthentication)
• Format BigQuery values into the existing result table pipeline, including headers on 0-row results

Test plan

• make check
• Manual: BIGQUERY SELECT 1 against a real GCP project
• Manual: BIGQUERY SELECT 1 WHERE FALSE confirms header + Empty set
• Manual: verify CLI_BIGQUERY_MAX_BYTES_BILLED is applied

Made with Cursor

[gemini-code-assist]

Code Review

This pull request integrates BigQuery support into the CLI tool, allowing users to execute BigQuery SQL queries using the new BIGQUERY <sql> statement. The changes include adding the cloud.google.com/go/bigquery dependency, managing the lifecycle of the BigQuery client within the session, implementing value formatting for BigQuery data types, and introducing new configuration variables (CLI_BIGQUERY_PROJECT, CLI_BIGQUERY_LOCATION, and CLI_BIGQUERY_MAX_BYTES_BILLED). Unit tests have been added to verify the statement parsing, value formatting, and client option creation. No review comments were provided, and there is no additional feedback to address.

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