feat(mcp): add list and get tools for saved queries and query history

[aminghadersohi]

SUMMARY

Adds four new MCP tools across two new domains (saved_query/ and query/):

• list_saved_queries — List saved SQL queries owned by the current user with filtering (label, db_id, schema), search, and pagination
• get_saved_query_info — Get saved query details by numeric ID or UUID
• list_queries — List SQL query history with filtering (status, database_id, schema), defaulting to most-recent-first (ordered by start_time desc, page_size 25)
• get_query_info — Get query history details by numeric ID

Both domains follow the existing database/, dataset/, chart/, and dashboard/ patterns: ModelListCore/ModelGetInfoCore for reuse, Pydantic schemas with field-level serialization context, @tool decorators with RBAC, and event_logger instrumentation.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A — backend API tools only

TESTING INSTRUCTIONS

# Run unit tests for the new tools
pytest tests/unit_tests/mcp_service/saved_query/
pytest tests/unit_tests/mcp_service/query/

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

❌ Patch coverage is 67.11409% with 98 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.19%. Comparing base (a273fe4) to head (d501ad2).

Files with missing lines	Patch %	Lines
superset/mcp_service/query/tool/list_queries.py	33.33%	20 Missing ⚠️
...mcp_service/saved_query/tool/list_saved_queries.py	33.33%	20 Missing ⚠️
superset/mcp_service/query/schemas.py	83.15%	15 Missing and 1 partial ⚠️
superset/mcp_service/saved_query/schemas.py	82.02%	15 Missing and 1 partial ⚠️
superset/mcp_service/query/tool/get_query_info.py	43.47%	13 Missing ⚠️
...p_service/saved_query/tool/get_saved_query_info.py	43.47%	13 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #40301    +/-   ##
========================================
  Coverage   64.19%   64.19%            
========================================
  Files        2591     2599     +8     
  Lines      138459   138757   +298     
  Branches    32118    32130    +12     
========================================
+ Hits        88880    89080   +200     
- Misses      48047    48143    +96     
- Partials     1532     1534     +2     

Flag	Coverage Δ
hive	39.54% <67.11%> (+0.13%)	⬆️
mysql	59.10% <67.11%> (+0.03%)	⬆️
postgres	59.18% <67.11%> (+0.03%)	⬆️
presto	41.21% <67.11%> (+0.12%)	⬆️
python	60.60% <67.11%> (+0.03%)	⬆️
sqlite	58.82% <67.11%> (+0.03%)	⬆️
unit	100.00% <ø> (ø)

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