chore(migration): Migrate code from googleapis/python-bigquery-magics into packages/bigquery-magics

[parthea]

See #14911.

This PR should be merged with a merge-commit, not a squash-commit, in order to preserve the git history.

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[gemini-code-assist]

Summary of Changes

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This pull request completes the migration of the bigquery-magics project into a new sub-package within the monorepo. This involved moving all source code, documentation, configuration, and CI/CD pipelines to ensure the project operates seamlessly in its new location. The primary goal was to consolidate the project while preserving its complete git history, as explicitly requested.

Highlights

• Codebase Migration: The entire bigquery-magics codebase has been migrated from googleapis/python-bigquery-magics to a new location within the monorepo at packages/bigquery-magics.
• Configuration and CI/CD Setup: All associated configuration files, including .coveragerc, .flake8, .gitignore, .pre-commit-config.yaml, .repo-metadata.json, and .trampolinerc, have been added to the new package directory. Extensive Kokoro and GitHub Actions workflows for documentation, linting, and unit/system tests across various Python versions (3.7-3.14) have also been established.
• Documentation and Contributing Guidelines: Comprehensive documentation files, including CHANGELOG.md, CODE_OF_CONDUCT.md, CONTRIBUTING.md, LICENSE, README.rst, and SECURITY.md, along with Sphinx configuration and templates, have been moved or created to support the new package structure.
• Core Logic and Utilities: The core Python source code for bigquery_magics, including modules for version helpers, BigQuery magic functionality, configuration context, client creation, environment detection, graph visualization server, line argument parsing, and Python string formatting for SQL, has been relocated.
• Sample Code and Testing Infrastructure: Sample snippets, their associated helper utilities, Pytest configurations, and Nox configurations for testing samples have been integrated into the new package structure.

Changelog

• packages/bigquery-magics/CHANGELOG.md
  • Added changelog entries for versions up to 0.12.1.
  • Version 0.12.1 includes a usability improvement to the graph visualizer.
  • Version 0.12.0 introduced schema view support and removed the bqsql magic.
  • Version 0.11.0 added support for Python 3.14.
  • Version 0.10.3 fixed property fields in graph visualization to be strings.
  • Version 0.10.2 dropped support for Python 3.7 and 3.8, and improved spanner-graph-notebook compatibility.

Activity

• Referenced issue Adopt split repo: _python-bigquery-magics_ #14911, indicating a related discussion or task.
• Explicitly requested a merge-commit instead of a squash-commit to preserve git history.

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