feat: initial support for dogpile caching

[cofin]

Introduce support for dogpile caching, including a new caching configuration and a null region implementation for scenarios where caching is disabled or dogpile.cache is not installed. Add unit tests to validate the caching behavior and configuration options.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 67.67338% with 289 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.62%. Comparing base (154bb61) to head (fc18993).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
advanced_alchemy/repository/_sync.py	45.85%	103 Missing and 8 partials ⚠️
advanced_alchemy/cache/manager.py	65.36%	81 Missing and 8 partials ⚠️
advanced_alchemy/repository/_async.py	69.75%	39 Missing and 23 partials ⚠️
advanced_alchemy/_listeners.py	76.34%	13 Missing and 9 partials ⚠️
advanced_alchemy/cache/serializers.py	94.18%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
- Coverage   80.34%   78.62%   -1.72%     
==========================================
  Files          87       92       +5     
  Lines        6431     7257     +826     
  Branches      838      989     +151     
==========================================
+ Hits         5167     5706     +539     
- Misses       1000     1237     +237     
- Partials      264      314      +50     

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