Custom dataclass decorator

[cgarciae]

Changes

• Creates a custom dataclass decorator that uses typing_extension.dataclass_transform to indicate to static analysis tools that static_field is a field specifier.
• Marks default as a keyword-only field. This is a breaking change, version should be bumped to 0.2.0 on next release.

[codecov]

Codecov Report

Merging #11 (7cca625) into main (a4bc7a8) will increase coverage by 0.21%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   97.45%   97.67%   +0.21%     
==========================================
  Files           2        3       +1     
  Lines         118      129      +11     
==========================================
+ Hits          115      126      +11     
  Misses          3        3              

Impacted Files	Coverage Δ
simple_pytree/pytree.py	99.04% <ø> (+1.65%)	⬆️
simple_pytree/dataclass.py	90.00% <90.00%> (ø)
simple_pytree/__init__.py	100.00% <100.00%> (ø)

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