Refactor bridge management and remove unused database drivers

[OutOfBedlam]

• Deleted the internal implementations for MSSQL, MySQL, PostgreSQL, and SQLite bridges.
• Updated the bridge management logic to utilize a new connector pattern for database bridges.
• Improved error handling and response structures in the bridge management service.
• Added unit tests for bridge management functionalities.
• Refactored the MQTT and NATS bridges to include stats snapshot functionality.
• Removed the Python bridge support from the exec command handling.
• Enhanced the runtime service to streamline SQL execution requests.

[codecov]

Codecov Report

❌ Patch coverage is 84.26667% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.35%. Comparing base (338ae2d) to head (ffb5584).

Files with missing lines	Patch %	Lines
mods/bridge/connector/sql_bridge.go	84.78%	26 Missing and 9 partials ⚠️
mods/bridge/connector/sql_base.go	82.27%	7 Missing and 7 partials ⚠️
mods/bridge/registry.go	57.14%	5 Missing and 1 partial ⚠️
mods/bridge/connector/connector.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #428      +/-   ##
==========================================
+ Coverage   65.03%   65.35%   +0.32%     
==========================================
  Files         354      351       -3     
  Lines       69766    69566     -200     
==========================================
+ Hits        45373    45468      +95     
+ Misses      19557    19261     -296     
- Partials     4836     4837       +1     

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