Improve error types implementation.

[nekitdev]

Error types are truly forced to be non-empty.

[codecov]

Codecov Report

Attention: Patch coverage is 87.75510% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.76%. Comparing base (f02016b) to head (15719b9).
Report is 7 commits behind head on main.

❗ Current head 15719b9 differs from pull request most recent head 9c3a2fd

Please upload reports for the commit 9c3a2fd to get more accurate results.

Files	Patch %	Lines
wraps/wraps/error_types.py	93.10%	2 Missing ⚠️
wraps/wraps/option.py	80.00%	2 Missing ⚠️
wraps/wraps/result.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   57.62%   60.76%   +3.13%     
==========================================
  Files          18       27       +9     
  Lines        1673     1840     +167     
==========================================
+ Hits          964     1118     +154     
- Misses        709      722      +13     

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