Add functionality to call a PostTransform method after the Webhook request has been transformed

[StefH]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 34.30%. Comparing base (6db5427) to head (d2d4f5a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/WireMock.Net/Settings/WebhookSettings.cs	55.55%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1223      +/-   ##
==========================================
+ Coverage   34.00%   34.30%   +0.29%     
==========================================
  Files         202      203       +1     
  Lines       33200    33318     +118     
==========================================
+ Hits        11289    11429     +140     
+ Misses      21405    21372      -33     
- Partials      506      517      +11     

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