Add request ip to request object

[Gyran]

Adds the client ip on the request object for cloud functions and trigger functions

useful for #3515 example

[codecov]

Codecov Report

Merging #4265 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4265      +/-   ##
==========================================
+ Coverage    92.2%   92.22%   +0.01%     
==========================================
  Files         116      116              
  Lines        8122     8124       +2     
==========================================
+ Hits         7489     7492       +3     
+ Misses        633      632       -1

Impacted Files	Coverage Δ
src/Routers/FunctionsRouter.js	94.59% <ø> (ø)	⬆️
src/triggers.js	94.17% <ø> (ø)	⬆️
src/middlewares.js	97.5% <100%> (+0.03%)	⬆️
src/RestWrite.js	93.34% <0%> (+0.18%)	⬆️

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[flovilmart]

Thanks for the PR @Gyran!