Add CFDI v4 support

[peguerosdc]

No description provided.

[codecov]

Codecov Report

Merging #9 (3a2aab6) into main (7dc63bf) will increase coverage by 1.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   96.37%   97.66%   +1.29%     
==========================================
  Files          10       13       +3     
  Lines         882     1070     +188     
==========================================
+ Hits          850     1045     +195     
+ Misses         32       25       -7     

Impacted Files	Coverage Δ
cfdibills/io.py	89.13% <100.00%> (+0.75%)	⬆️
cfdibills/schemas/__init__.py	100.00% <100.00%> (ø)
cfdibills/schemas/catalogs.py	100.00% <100.00%> (ø)
cfdibills/schemas/cfdi33.py	100.00% <100.00%> (ø)
cfdibills/schemas/cfdi40.py	100.00% <100.00%> (ø)
cfdibills/schemas/complementos.py	100.00% <100.00%> (ø)
cfdibills/schemas/fields.py	100.00% <100.00%> (ø)
cfdibills/schemas/mixins.py	100.00% <100.00%> (ø)
cfdibills/schemas/validators.py	90.90% <100.00%> (ø)
cfdibills/verifiers.py	61.53% <100.00%> (+6.99%)	⬆️

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