Add Then/ThenAsync support for functions that don't explicitly return…

[amantinband]

… erroror

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (1285a3f) 100.00% compared to head (da73db4) 98.02%.

❗ Current head da73db4 differs from pull request most recent head f09e070. Consider uploading reports for the commit f09e070 to get more accurate results

Files	Patch %	Lines
src/ErrorOr.cs	66.66%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #80      +/-   ##
===========================================
- Coverage   100.00%   98.02%   -1.98%     
===========================================
  Files            5        5              
  Lines          183      203      +20     
  Branches        17       19       +2     
===========================================
+ Hits           183      199      +16     
- Misses           0        4       +4     

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