Add Errors to generated types files.

[sentilesdal]

Add Errors to the generated types files. See ExampleTypes.py file for a good example.

[codecov-commenter]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (9810497) 66.76% compared to head (9ed4c31) 67.01%.

Files	Patch %	Lines
pypechain/utilities/abi.py	50.00%	26 Missing ⚠️
pypechain/render/contract.py	16.66%	10 Missing ⚠️
pypechain/render/types.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
+ Coverage   66.76%   67.01%   +0.24%     
==========================================
  Files          46       46              
  Lines        1974     2101     +127     
==========================================
+ Hits         1318     1408      +90     
- Misses        656      693      +37     

Flag	Coverage Δ
unittests	67.01% <71.96%> (+0.24%)	⬆️

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[slundqui]

LGTM