Transform body as file

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #388 into master will increase coverage by 0.03%.
The diff coverage is 89.13%.

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
+ Coverage   80.32%   80.35%   +0.03%     
==========================================
  Files         117      118       +1     
  Lines        4701     4730      +29     
==========================================
+ Hits         3776     3801      +25     
- Misses        925      929       +4

Impacted Files	Coverage Δ
src/WireMock.Net/Server/FluentMockServer.Admin.cs	62.04% <0%> (ø)	⬆️
...ock.Net/Transformers/ResponseMessageTransformer.cs	98.38% <100%> (+0.22%)	⬆️
src/WireMock.Net/Transformers/HandlebarsContext.cs	100% <100%> (ø)
src/WireMock.Net/ResponseBuilders/Response.cs	95.26% <100%> (+0.04%)	⬆️
...eMock.Net/Transformers/HandlebarsContextFactory.cs	100% <100%> (ø)	⬆️
src/WireMock.Net/Admin/Mappings/ResponseModel.cs	100% <100%> (ø)	⬆️
src/WireMock.Net/Serialization/MappingConverter.cs	71.97% <20%> (-1.71%)	⬇️

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