feat: frozen models

[tlambert03]

No description provided.

[codecov]

Codecov Report

Merging #31 (81c145f) into main (f086639) will increase coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head 81c145f differs from pull request most recent head d45b97c. Consider uploading reports for the commit d45b97c to get more accurate results

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   98.87%   98.94%   +0.07%     
==========================================
  Files          30       30              
  Lines        1422     1422              
==========================================
+ Hits         1406     1407       +1     
+ Misses         16       15       -1     

Impacted Files	Coverage Δ
src/app_model/registries/_register.py	100.00% <100.00%> (+2.12%)	⬆️
src/app_model/types/_base.py	100.00% <100.00%> (ø)

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