SEC-906 Cluster Registry CRUD

[tadsul]

• Added Cluster Registry register, unregister command
  https://confluentinc.atlassian.net/wiki/spaces/PM/pages/1118899222/Cluster+Registry+CLI+UX
• Modified Cluster Registry List Command to align with ccloud cluster list command
  https://confluentinc.atlassian.net/wiki/spaces/PM/pages/1273331929/2020-05-18+CR+CLI+Cluster+List+Plotting

Checklist

1. [CRUCIAL] Is the change for CP or CCloud functionalities that are already live in prod?

   • yes: ok
   • no: DO NOT MERGE until the required functionalites are live in prod

2. Did you add/update any commands that accept secrets as args/flags?

   • yes: did you update secretCommandFlags and/or secretCommandArgs in internal/pkg/analytics/analytics.go
   • no: ok

What

References

Test&Review

[DABH]

Left a few comments, let me know what you think and then I think I can +1. Thanks!

[DABH]

(Also, @tadsul you should probably merge master into this branch, and then make sure CI passes)

[DABH]

+1 once master is properly merged into this branch and once CI passes

[DABH]

(Also please delete that unused file)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@8b09744). Click here to learn what that means.
The diff coverage is 82.59%.

@@            Coverage Diff            @@
##             master     #513   +/-   ##
=========================================
  Coverage          ?   51.91%           
=========================================
  Files             ?      170           
  Lines             ?    13935           
  Branches          ?        0           
=========================================
  Hits              ?     7234           
  Misses            ?     5850           
  Partials          ?      851           

Impacted Files	Coverage Δ
cmd/lint/main.go	0.00% <ø> (ø)
internal/cmd/kafka/command_cluster_cloud.go	81.60% <ø> (ø)
internal/pkg/errors/cobra.go	72.41% <ø> (ø)
internal/cmd/cluster/command_registry.go	70.00% <70.00%> (ø)
internal/pkg/cluster/cluster.go	80.55% <80.55%> (ø)
internal/cmd/cluster/command_list.go	82.60% <83.33%> (ø)
internal/cmd/connect/command_cluster_onprem.go	88.23% <88.23%> (ø)
internal/cmd/kafka/command_cluster_onprem.go	88.23% <88.23%> (ø)
internal/cmd/ksql/command_cluster_onprem.go	88.23% <88.23%> (ø)
...rnal/cmd/schema-registry/command_cluster_onprem.go	88.23% <88.23%> (ø)
... and 6 more

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[csreesan]

lgtm, just a nit comment