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 99.15%. Comparing base (1ffd940) to head (b2c74c2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   99.15%   99.15%           
=======================================
  Files           9        9           
  Lines         946      947    +1     
=======================================
+ Hits          938      939    +1     
  Misses          8        8           

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