Add get/retry experiment commands. Support experiment retries

[jessesuen]

• Add kubectl argo rollouts get experiment NAME
• Add kubectl argo rollouts retry experiment NAME

Support retrying experiments by using a collision counter for analysis runs in experiments.

[codecov]

Codecov Report

Merging #263 into master will decrease coverage by 0.19%.
The diff coverage is 81.14%.

@@           Coverage Diff            @@
##           master    #263     +/-   ##
========================================
- Coverage   83.69%   83.5%   -0.2%     
========================================
  Files          59      61      +2     
  Lines        5306    5475    +169     
========================================
+ Hits         4441    4572    +131     
- Misses        632     664     +32     
- Partials      233     239      +6

Impacted Files	Coverage Δ
pkg/kubectl-argo-rollouts/info/info.go	100% <ø> (ø)	⬆️
pkg/kubectl-argo-rollouts/info/pod_info.go	50.48% <100%> (+0.48%)	⬆️
pkg/kubectl-argo-rollouts/info/replicaset_info.go	79.1% <100%> (+0.31%)	⬆️
pkg/kubectl-argo-rollouts/info/rollout_info.go	74.26% <100%> (+0.19%)	⬆️
experiments/experiment.go	93.95% <100%> (+0.77%)	⬆️
pkg/kubectl-argo-rollouts/info/analysisrun_info.go	78.57% <100%> (+0.79%)	⬆️
rollout/analysis.go	88.81% <100%> (+1.02%)	⬆️
pkg/kubectl-argo-rollouts/cmd/retry/retry.go	100% <100%> (ø)	⬆️
...kg/kubectl-argo-rollouts/cmd/get/get_experiment.go	62.35% <62.35%> (ø)
pkg/kubectl-argo-rollouts/info/experiment_info.go	63.76% <77.27%> (+4.3%)	⬆️
... and 7 more

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[dthomson25]

Added small comments. I wanted to look at the codecov before approving, but the website isn't loading atm.

[dthomson25]

Was this intentional?

[jessesuen]

Yes

[dthomson25]

LGTM