Add TypeForm support

[HexDecimal]

Converts containers to use TypeForm instead of Type. This allows for type expressions to be used as component types.

Currently waiting on Mypy to officially support TypeForm.

Closes #36

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.14%. Comparing base (d48de23) to head (7bf19c2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files           9        9           
  Lines         936      936           
=======================================
  Hits          928      928           
  Misses          8        8           

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