Add convenient Pydantic readers

[cthoyt]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.64%. Comparing base (9c35eb0) to head (3aa090b).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pystow/utils/safe_open.py	50.00%	3 Missing ⚠️
src/pystow/utils/pydantic_utils.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   75.81%   75.64%   -0.18%     
==========================================
  Files          17       17              
  Lines        1774     1782       +8     
  Branches      211      211              
==========================================
+ Hits         1345     1348       +3     
- Misses        336      341       +5     
  Partials       93       93              

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