added metric to see how often caduceus is modifying the wrp

[kristinapathak]

part of investigating what we want to do for #174

[codecov]

Codecov Report

Merging #216 into master will increase coverage by 1.16%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
+ Coverage   68.92%   70.09%   +1.16%     
==========================================
  Files           7        7              
  Lines         737      759      +22     
==========================================
+ Hits          508      532      +24     
+ Misses        216      214       -2     
  Partials       13       13              

Impacted Files	Coverage Δ
main.go	0.00% <0.00%> (ø)
http.go	94.44% <70.00%> (-5.56%)	⬇️
metrics.go	100.00% <100.00%> (ø)
caduceus_type.go	100.00% <0.00%> (ø)
outboundSender.go	84.46% <0.00%> (+2.05%)	⬆️

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