fix(oracledb): modernize adapter config

[cofin]

Summary

Refreshes the Oracle adapter config surface for current python-oracledb connection, pool, callback, and driver-feature behavior.

Details

• Expands OracleConnectionParams and OraclePoolParams with current python-oracledb options for authentication, networking, TLS, sharding, tagging, DRCP, pool configuration, and database event support.
• Narrows finite Oracle settings with enums and literals for protocol, server type, pool boundary, vector return format, and SQLSpec event backend selection.
• Removes stale threaded forwarding while preserving native pool session_callback behavior.
• Chains SQLSpec internal setup, native session callbacks, and on_connection_create in a defined order for sync and async pools, including awaitable async callbacks.
• Clarifies SQLSpec event queue support versus python-oracledb database events, and avoids advertising an adapter switch that cannot force unsupported native pipeline execution.
• Adds unit coverage for the typed config surface, extra kwarg forwarding, stale option filtering, and callback ordering.

Review Notes

This branch is rebased onto the latest main and keeps the Oracle changes focused on config fidelity and callback behavior.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.46835% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.33%. Comparing base (0dc2787) to head (95a3730).

Files with missing lines	Patch %	Lines
sqlspec/adapters/oracledb/config.py	97.46%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #513      +/-   ##
==========================================
+ Coverage   74.30%   74.33%   +0.02%     
==========================================
  Files         439      439              
  Lines       53273    53339      +66     
  Branches     8451     8455       +4     
==========================================
+ Hits        39585    39648      +63     
  Misses      11061    11061              
- Partials     2627     2630       +3     

Flag	Coverage Δ
integration	58.28% <91.13%> (+0.03%)	⬆️
py3.10	71.11% <94.93%> (+0.03%)	⬆️
py3.11	71.13% <94.93%> (+0.02%)	⬆️
py3.12	71.12% <94.93%> (+0.02%)	⬆️
py3.13	71.12% <94.93%> (+0.02%)	⬆️
py3.14	73.48% <85.18%> (+<0.01%)	⬆️
unit	61.54% <93.67%> (+0.06%)	⬆️

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Files with missing lines	Coverage Δ
sqlspec/adapters/oracledb/config.py	87.86% <97.46%> (+2.91%)	⬆️

... and 1 file with indirect coverage changes

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