Update the snapshot helper to be able to save raw json and parsed and validated response struct

[mwieser]

Added a Save function to the snapshot helper which snapshots the (prettified) raw json response body first and then calls ParseResponseAndValidate and snapshots the parsed and validated struct.

Also enhanced the replacer when using Skip by supporting multiline skips for maps or slices.

[codecov]

Codecov Report

Patch coverage: 76.00% and project coverage change: +0.39 🎉

Comparison is base (d14d4b2) 62.86% compared to head (6fd1c13) 63.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #206      +/-   ##
==========================================
+ Coverage   62.86%   63.25%   +0.39%     
==========================================
  Files          78       78              
  Lines        6053     6088      +35     
==========================================
+ Hits         3805     3851      +46     
+ Misses       1635     1624      -11     
  Partials      613      613              

Impacted Files	Coverage Δ
internal/test/helper_request.go	58.33% <72.72%> (+20.00%)	⬆️
internal/test/helper_snapshot.go	76.59% <76.92%> (-3.07%)	⬇️

... and 2 files with indirect coverage changes

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