add retry command line flag on rekor-cli

[bobcallaway]

Depends-on: #1096

Release Note

adds --retry option to rekor-cli commands to automatically retry calls to a rekor server based on transient errors; default value is to retry 3 times

[cpanato]

coool

[codecov-commenter]

Codecov Report

Merging #1097 (16dc702) into main (a47adc1) will increase coverage by 0.04%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##             main    #1097      +/-   ##
==========================================
+ Coverage   63.73%   63.78%   +0.04%     
==========================================
  Files          82       82              
  Lines        7567     7585      +18     
==========================================
+ Hits         4823     4838      +15     
- Misses       2119     2121       +2     
- Partials      625      626       +1     

Flag	Coverage Δ
e2etests	48.56% <70.83%> (+0.13%)	⬆️
unittests	40.91% <75.00%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/rekor-cli/app/log_proof.go	10.93% <0.00%> (ø)
cmd/rekor-cli/app/get.go	50.68% <100.00%> (ø)
cmd/rekor-cli/app/log_info.go	55.00% <100.00%> (ø)
cmd/rekor-cli/app/pflags.go	88.48% <100.00%> (+1.12%)	⬆️
cmd/rekor-cli/app/root.go	66.66% <100.00%> (+0.59%)	⬆️
cmd/rekor-cli/app/search.go	57.85% <100.00%> (ø)
cmd/rekor-cli/app/upload.go	53.98% <100.00%> (ø)
cmd/rekor-cli/app/verify.go	56.19% <100.00%> (ø)
pkg/types/alpine/v0.0.1/entry.go	72.35% <0.00%> (-1.22%)	⬇️
pkg/types/helm/v0.0.1/entry.go	47.47% <0.00%> (ø)

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