upgrade for better dataclass support

[ajatkj]

• Re-written core logic a bit for full dataclass support (by retaining the original init method)
• Support for InitVars
• Fix for getting annotations using get_type_hints to support import of annotation from future

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f53e12b) to head (138672e).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          179       209   +30     
=========================================
+ Hits           179       209   +30     

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[ajatkj]

Fixes #9 and #10
Will release the package soon.