Async SQLAlchemy Support

[soapun]

No description provided.

[wey-gu]

sorry I missed this pr!

Thanks a ton for the great contribution!

[codecov]

Codecov Report

❌ Patch coverage is 49.05660% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.67%. Comparing base (c1acab7) to head (af88820).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/py_pglite/sqlalchemy/manager_async.py	53.60%	45 Missing ⚠️
src/py_pglite/sqlalchemy/__init__.py	0.00%	5 Missing ⚠️
src/py_pglite/pytest_plugin.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   69.54%   67.67%   -1.88%     
==========================================
  Files          14       15       +1     
  Lines        1054     1160     +106     
==========================================
+ Hits          733      785      +52     
- Misses        321      375      +54     

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