feat: Support FrozenSet

[yukinarit]

#83

[codecov]

Codecov Report

Base: 90.84% // Head: 90.78% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (6a84219) compared to base (1a0f7e9).
Patch coverage: 84.61% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   90.84%   90.78%   -0.07%     
==========================================
  Files          11       11              
  Lines        1617     1627      +10     
  Branches      342      345       +3     
==========================================
+ Hits         1469     1477       +8     
- Misses        105      107       +2     
  Partials       43       43              

Impacted Files	Coverage Δ
serde/compat.py	82.59% <75.00%> (-0.32%)	⬇️
serde/de.py	97.34% <100.00%> (+0.03%)	⬆️

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