feat(adk): add postgres adapter profile toggles

[cofin]

Summary

• Add PsycopgADKConfig and PsqlpyADKConfig as adapter-local ADK configs extending shared ADKConfig.
• Keep PostgreSQL-family generated event columns and covering indexes opt-in through extension_config["adk"].
• Extend asyncpg/psycopg/psqlpy tests for adapter-local config shape and default-vs-opt-in DDL behavior.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.30159% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.56%. Comparing base (14017de) to head (f86a9c8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sqlspec/adapters/psqlpy/adk/store.py	86.20%	2 Missing and 2 partials ⚠️
sqlspec/adapters/psycopg/adk/store.py	87.09%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #554      +/-   ##
==========================================
+ Coverage   75.51%   75.56%   +0.04%     
==========================================
  Files         445      445              
  Lines       58654    58918     +264     
  Branches     9028     9138     +110     
==========================================
+ Hits        44294    44522     +228     
- Misses      11501    11523      +22     
- Partials     2859     2873      +14     

Flag	Coverage Δ
integration	59.56% <71.42%> (+0.03%)	⬆️
py3.10	73.93% <87.30%> (+0.05%)	⬆️
py3.11	73.95% <87.30%> (+0.05%)	⬆️
py3.12	73.94% <87.30%> (+0.05%)	⬆️
py3.13	73.94% <87.30%> (+0.05%)	⬆️
py3.14	74.75% <86.44%> (+0.04%)	⬆️
unit	61.50% <87.30%> (+0.14%)	⬆️

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Files with missing lines	Coverage Δ
sqlspec/adapters/psqlpy/adk/__init__.py	100.00% <100.00%> (ø)
sqlspec/adapters/psycopg/adk/__init__.py	100.00% <100.00%> (ø)
sqlspec/adapters/psqlpy/adk/store.py	52.26% <86.20%> (+2.55%)	⬆️
sqlspec/adapters/psycopg/adk/store.py	59.77% <87.09%> (+1.29%)	⬆️

... and 7 files with indirect coverage changes

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