Implement list command in kubectl plugin

[jessesuen]

Example output:

$ go run cmd/kubectl-argo-rollouts/main.go list --all-namespaces
NAMESPACE      NAME                         STRATEGY    STATUS        STEP  SET-WEIGHT  READY  DESIRED  UP-TO-DATE  AVAILABLE
default        canary-demo                  Canary      Progressing   2/3   20          5/5    5        1           5
default        rollout-test-helm-guestbook  BlueGreen   Healthy       -     -           1/1    1        1           1
istio-rollout  istio-rollout                Canary      Degraded      1/2   20          5/5    5        1           5
nginx-rollout  nginx-rollout                Canary      Degraded      1/2   20          5/5    5        1           5

[codecov]

Codecov Report

Merging #204 into master will decrease coverage by 0.3%.
The diff coverage is 86.33%.

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
- Coverage   83.79%   83.48%   -0.31%     
==========================================
  Files          44       45       +1     
  Lines        3665     3700      +35     
==========================================
+ Hits         3071     3089      +18     
- Misses        423      441      +18     
+ Partials      171      170       -1

Impacted Files	Coverage Δ
pkg/kubectl-argo-rollouts/cmd/cmd.go	100% <100%> (ø)	⬆️
pkg/kubectl-argo-rollouts/cmd/list/list.go	84% <84%> (ø)
pkg/kubectl-argo-rollouts/cmd/list/rollloutinfo.go	90% <90%> (ø)
rollout/controller.go	65.71% <0%> (-4.29%)	⬇️
utils/query/query.go	100% <0%> (ø)	⬆️
utils/analysis/filter.go	100% <0%> (ø)	⬆️
utils/experiment/experiment.go	100% <0%> (ø)	⬆️
utils/experiment/filter.go
... and 3 more

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[dthomson25]

LGTM