fix: display stored procedure result sets

[Maxteabag]

Summary

• route MySQL/MariaDB CALL and SQL Server EXEC/EXECUTE procedure calls through row-returning execution
• return the first row-bearing result set and drain all remaining status/result sets
• keep procedure classification provider-specific so Oracle and Firebird non-query commit behavior is unchanged
• distinguish SQL Server procedures from EXECUTE AS and dynamic SQL

Supersedes #265 while preserving its intended behavior and resolving the review blockers.

Verification

• uv run pytest -q tests/unit (1112 passed, 2 skipped)
• focused stored-procedure and SQL Server suite (43 passed)
• uv run ruff check ...
• autoreview clean: no accepted/actionable findings

Thanks @probeldev for the original report and implementation in #265.