Refactor forms and add VariableListForm

[codecov[bot]]

Codecov Report

Merging #161 (ad44f1e) into main (2ec1224) will decrease coverage by 0.86%. The diff coverage is 86.78%.

:exclamation: Current head ad44f1e differs from pull request most recent head b804df0. Consider uploading reports for the commit b804df0 to get more accurate results

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   91.97%   91.10%   -0.87%     
==========================================
  Files          15       17       +2     
  Lines        1034     1124      +90     
  Branches      142      156      +14     
==========================================
+ Hits          951     1024      +73     
- Misses         66       82      +16     
- Partials       17       18       +1     

Impacted Files	Coverage Δ
formlessness/forms.py	83.04% <80.35%> (-8.36%)	:arrow_down:
formlessness/base_classes.py	91.48% <83.33%> (+1.01%)	:arrow_up:
formlessness/fields.py	99.30% <100.00%> (ø)
formlessness/sections.py	100.00% <100.00%> (ø)
tests/test_basic_form.py	100.00% <100.00%> (ø)
tests/test_list_form.py	100.00% <100.00%> (ø)
tests/utils.py	100.00% <100.00%> (ø)
formlessness/constraints.py	86.92% <0.00%> (-0.77%)	:arrow_down:
formlessness/deserializers.py	89.23% <0.00%> (+1.53%)	:arrow_up:
... and 1 more

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