Modernize Zoom API Wrapper

[jsteinberg1]

This comprehensive update modernizes the basic_zoom library. Key changes include:

1. Consolidated Architecture: Both ZoomAPIClient (Sync) and AsyncZoomAPIClient (Async) now share a common BaseZoomClient and use httpx under the hood.
2. Modern Standards: Transitioned to a src/ layout and adopted pyproject.toml for dependency management.
3. Improved DX: Added full type hinting, Google-style docstrings, and a dedicated User resource model to separate data from HTTP logic.
4. Robust Error Handling: Replaced generic exceptions with a specific hierarchy and implemented automatic retries for common API failures.
5. Testing: Developed a robust test suite in tests/ utilizing pytest and respx.
6. Documentation: Greatly expanded README.md with quick-start guides and detailed examples.

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PR created automatically by Jules for task 8293625973899032538 started by @jsteinberg1

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