Add standardized caching of sentence transformers

[cthoyt]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.28%. Comparing base (d39e5e6) to head (e0bf927).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pystow/api.py	14.28%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
- Coverage   75.53%   75.28%   -0.25%     
==========================================
  Files          17       17              
  Lines        1721     1728       +7     
  Branches      205      206       +1     
==========================================
+ Hits         1300     1301       +1     
- Misses        331      337       +6     
  Partials       90       90              

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