Adding possibility to specity cookies to forward

[stefanoj3]

Addressing the second point of #32

[codecov]

Codecov Report

Merging #40 into master will increase coverage by 1.43%.
The diff coverage is 90.36%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
+ Coverage   86.51%   87.94%   +1.43%     
==========================================
  Files          16       18       +2     
  Lines         497      556      +59     
==========================================
+ Hits          430      489      +59     
- Misses         35       36       +1     
+ Partials       32       31       -1

Impacted Files	Coverage Δ
pkg/scan/client/cookie/jar.go	100% <100%> (ø)
pkg/scan/client/user_agent.go	100% <100%> (ø)
pkg/scan/bootstrap.go	91.3% <100%> (+7.63%)	⬆️
pkg/cmd/scan.go	88.76% <100%> (+3.04%)	⬆️
pkg/scan/client/client.go	79.31% <79.31%> (ø)
pkg/cmd/config.go	65.95% <90.47%> (+19.8%)	⬆️
... and 1 more

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