FEAT: Add session audit context API (set_audit_context / get_audit_context)

[kapilsamant]

Work Item / Issue Reference

GitHub Issue: #621

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Summary

Add session-level auditing/tracing API to the Connection class via two new methods:

set_audit_context() -> Sets session metadata (application, module, action, user_id, and arbitrary extra keys) on the current connection using sp_set_session_context. Supports read_only mode, input validation with length limits, parameterized query execution, and local caching of set values.
get_audit_context()-> Returns a copy of the locally cached session context dictionary.
Values set through this API are visible to SESSION_CONTEXT() in T-SQL, Extended Events, sys.dm_exec_sessions, and audit specifications.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a session metadata/auditing API on the SQL Server connection using sp_set_session_context, plus a test suite to validate local caching, server round-trips, and error conditions.

Changes:

• Implement Connection.set_audit_context() to set/merge/clear session context keys and maintain a local cache.
• Implement Connection.get_audit_context() to expose the cached context safely (copy).
• Add pytest coverage for server round-trip behavior, merging, clearing, read-only keys, closed-connection errors, and size/type validation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
tests/test_023_audit_context.py	New tests covering the new audit context API behaviors and error cases.
mssql_python/connection.py	Adds set_audit_context/get_audit_context APIs backed by sp_set_session_context with validation and caching.

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[kapilsamant]

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