Add support to use 'mapping' object in in reponse templating

[StefH]

No description provided.

[StefH]

#772

[codecov]

Codecov Report

Merging #798 (6179f0d) into master (775c4fb) will decrease coverage by 0.01%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   72.42%   72.41%   -0.02%     
==========================================
  Files         211      211              
  Lines        7354     7362       +8     
  Branches      764      765       +1     
==========================================
+ Hits         5326     5331       +5     
- Misses       1797     1800       +3     
  Partials      231      231              

Impacted Files	Coverage Δ
.../ResponseProviders/DynamicAsyncResponseProvider.cs	0.00% <ø> (ø)
...k.Net/ResponseProviders/DynamicResponseProvider.cs	100.00% <ø> (ø)
...et/ResponseProviders/ProxyAsyncResponseProvider.cs	100.00% <ø> (ø)
...eMock.Net/Settings/WireMockServerSettingsParser.cs	0.00% <0.00%> (ø)
src/WireMock.Net/Transformers/Transformer.cs	91.22% <46.15%> (-1.46%)	⬇️
src/WireMock.Net/Owin/WireMockMiddleware.cs	86.82% <75.00%> (ø)
src/WireMock.Net/Http/WebhookSender.cs	84.61% <100.00%> (+0.40%)	⬆️
src/WireMock.Net/Mapping.cs	96.77% <100.00%> (ø)
src/WireMock.Net/ResponseBuilders/Response.cs	92.81% <100.00%> (ø)
src/WireMock.Net/ScenarioState.cs	100.00% <100.00%> (ø)
... and 1 more

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