Basic Metrics for Pod/Node Reaper

[eytan-avisror]

This exposes basic metrics for both pod & node reaper

[codecov]

Codecov Report

Merging #64 (ad167f1) into master (249d5fd) will decrease coverage by 0.53%.
The diff coverage is 31.03%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
- Coverage   60.19%   59.66%   -0.54%     
==========================================
  Files          11       11              
  Lines        1510     1537      +27     
==========================================
+ Hits          909      917       +8     
- Misses        506      524      +18     
- Partials       95       96       +1     

Impacted Files	Coverage Δ
pkg/reaper/podreaper/types.go	100.00% <ø> (ø)
pkg/reaper/nodereaper/types.go	65.51% <20.00%> (-23.96%)	⬇️
pkg/reaper/podreaper/podreaper.go	73.30% <33.33%> (-2.30%)	⬇️
pkg/reaper/nodereaper/nodereaper.go	46.72% <40.00%> (-0.07%)	⬇️
pkg/reaper/common/prom.go	63.63% <50.00%> (ø)

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[shaoxt]

LGTM