move fasthttp out of core library, and into integration package

[iamemilio]

Links

Possible solution to #807

Details

[codecov-commenter]

Codecov Report

Merging #808 (107c958) into develop (a1142ca) will decrease coverage by 0.21%. Report is 2 commits behind head on develop. The diff coverage is 37.06%.

@@             Coverage Diff             @@
##           develop     #808      +/-   ##
===========================================
- Coverage    81.10%   80.89%   -0.21%     
===========================================
  Files          136      139       +3     
  Lines        12393    12545     +152     
===========================================
+ Hits         10051    10148      +97     
- Misses        2062     2111      +49     
- Partials       280      286       +6     

Files	Coverage Δ
v3/newrelic/context.go	86.36% <ø> (+26.98%)	:arrow_up:
v3/newrelic/segments.go	69.35% <0.00%> (-0.86%)	:arrow_down:
v3/integrations/nrfasthttp/instrumentation.go	54.76% <54.76%> (ø)
v3/newrelic/instrumentation.go	59.13% <0.00%> (-9.12%)	:arrow_down:
v3/integrations/nrfasthttp/segment.go	41.66% <41.66%> (ø)

... and 6 files with indirect coverage changes

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[iamemilio]

This needs some revision, we can not copy the request object

[iamemilio]

The more I look at this, the more I realize there may not be a good way to capture a Fasthttp.request. It will always throw an error because of the copy operation, and there is not good way to convert it to an object we can read and use.