docs(bigquery): initial preview samples

[shollyman]

This PR adds some initial snippets that target the pre-alpha BigQuery Cloud Client Library.

[gemini-code-assist]

Summary of Changes

Hello @shollyman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a comprehensive set of initial code samples for the pre-alpha BigQuery Cloud Client Library in Go. These samples are designed to help developers quickly get started with basic client interactions and common dataset management tasks, while also ensuring all project dependencies are up-to-date.

Highlights

• New BigQuery Preview Samples: Added initial code snippets targeting the pre-alpha BigQuery Cloud Client Library for Go, demonstrating fundamental interactions with BigQuery.
• Client Usage Examples: Introduced a sample (bigquery_client_usage.go) showcasing how to instantiate BigQuery clients using both gRPC and REST transports, and how to list datasets and tables.
• Dataset Management Samples: Provided new samples for common BigQuery dataset operations, including creating (bigquery_create_dataset.go), deleting (bigquery_delete_dataset.go), listing (bigquery_list_datasets.go), and updating (bigquery_update_dataset.go) datasets, with appropriate error handling and best practices like optimistic concurrency control.
• Dependency Updates: Updated various Go module dependencies in go.mod and go.sum to newer versions, including core Google Cloud libraries and OpenTelemetry components, to support the new BigQuery client library.

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[gemini-code-assist]

Code Review

This pull request introduces a solid set of initial code samples for the preview BigQuery Cloud Client Library. The examples are well-structured, covering basic client usage and essential dataset operations like creation, deletion, listing, and updating. The code is clear and provides valuable demonstrations of the new library's features.

[gemini-code-assist]

The value 86400 is a magic number representing the number of seconds in a day. To improve readability and maintainability, it's better to show the calculation explicitly. This makes the origin of the number clear without relying solely on the comment.

Suggested change

	Value: 90 * 86400 * 1000, // 90 days in milliseconds.
	Value: 90 * (24 * 60 * 60 * 1000), // 90 days in milliseconds.

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• bigquery/snippets_preview/client/bigquery_client_usage.go:17, tag bigquery_client_usage
• bigquery/snippets_preview/dataset/bigquery_create_dataset.go:17, tag bigquery_create_dataset_preview
• bigquery/snippets_preview/dataset/bigquery_delete_dataset.go:17, tag bigquery_delete_dataset_preview
• bigquery/snippets_preview/dataset/bigquery_list_datasets.go:17, tag bigquery_list_datasets_preview
• bigquery/snippets_preview/dataset/bigquery_update_dataset.go:17, tag bigquery_update_dataset_preview

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