Do not allow incomplete objects to be created

[dkraczkowski]

This PR changes current behaviour and disallows decoding incomplete objects unless missing properties are marked as optional with typing.Optional annotation.

[codecov-commenter]

Codecov Report

Merging #24 (bdf5643) into main (3d7001e) will decrease coverage by 0.11%.
The diff coverage is 93.33%.

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@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   95.30%   95.19%   -0.11%     
==========================================
  Files          39       39              
  Lines        2151     2187      +36     
==========================================
+ Hits         2050     2082      +32     
- Misses        101      105       +4     

Files Changed	Coverage Δ
chili/encoder.py	93.59% <75.00%> (-0.68%)	⬇️
tests/test_decode.py	98.64% <93.54%> (-1.36%)	⬇️
chili/decoder.py	87.80% <100.00%> (+0.07%)	⬆️
chili/error.py	100.00% <100.00%> (ø)
chili/typing.py	87.60% <100.00%> (ø)
tests/usecases/dataclasses_test.py	100.00% <100.00%> (ø)
tests/usecases/decodable_test.py	100.00% <100.00%> (ø)

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