Add BigQuery for targets

[yusufozturk]

This pull request adds comprehensive documentation for configuring BigQuery as a data target, including schema details, configuration options, authentication, error handling, and usage examples. It also updates the documentation sidebar to include the new BigQuery target page.

BigQuery Target Documentation:

• Added a new file, bigquery.mdx, with detailed documentation on configuring BigQuery as a streaming target, including schema definition, multiple table support, authentication options, error handling, and example configurations.

Documentation Navigation:

• Updated the documentation sidebar in sidebars.ts to include the BigQuery target, making it accessible from the configuration targets section.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev-add-bigquery

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