Support deserializing Python dataclass into structs / mappings

[davidhewitt]

Closes #93

[codecov]

Codecov Report

❌ Patch coverage is 92.06349% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.48%. Comparing base (a444b75) to head (838b3cd).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/de.rs	92.06%	0 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   83.56%   84.48%   +0.91%     
==========================================
  Files           3        3              
  Lines        1065     1186     +121     
  Branches     1065     1186     +121     
==========================================
+ Hits          890     1002     +112     
  Misses        118      118              
- Partials       57       66       +9     

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