Add file opening operations

[cthoyt]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 48.48485% with 17 lines in your changes missing coverage. Please review.

Project coverage is 71.30%. Comparing base (8bd7622) to head (cd11882).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pystow/utils.py	48.48%	15 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   72.07%   71.30%   -0.78%     
==========================================
  Files           8        8              
  Lines        1010     1042      +32     
  Branches       96      102       +6     
==========================================
+ Hits          728      743      +15     
- Misses        242      257      +15     
- Partials       40       42       +2     

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