Add WithBodyAsType to RequestMatcher

[StefH]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 55.88235% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.08%. Comparing base (c25d8f3) to head (0130383).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...al/Matchers/Request/RequestMessageBodyMatcher`1.cs	53.84%	24 Missing ⚠️
...ck.Net.Minimal/RequestBuilders/Request.WithBody.cs	60.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1388      +/-   ##
==========================================
+ Coverage   34.67%   36.08%   +1.40%     
==========================================
  Files         152      153       +1     
  Lines       37148    36931     -217     
==========================================
+ Hits        12882    13327     +445     
+ Misses      23775    23110     -665     
- Partials      491      494       +3     

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