feat(monad)!: add ensure extensions

[draekien]

This change removes the async Ok and Error methods that were accidentally exposed in the last monad version. As such it is a breaking change.

[codecov]

Codecov Report

Attention: Patch coverage is 85.36585% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.77%. Comparing base (98548d1) to head (df40755).

Files	Patch %	Lines
...luentUtils.Monad/Extensions/PipeAsyncExtensions.cs	76.92%	3 Missing ⚠️
src/FluentUtils.Monad/Extensions/PipeExtensions.cs	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   81.66%   81.77%   +0.11%     
==========================================
  Files          60       63       +3     
  Lines         818      856      +38     
  Branches       64       67       +3     
==========================================
+ Hits          668      700      +32     
- Misses        131      137       +6     
  Partials       19       19              

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