Added cluster domain claim commands

[vyasgun]

Changes

Added create, delete, and list commands for cluster domain claim resource

• For creating a domainmapping, the related cluster domain claim object needs to be created first.
• By adding this command, user doesn't have to switch to kubectl to create it. They can use kn admin commands for CDC management.
• Added unit tests for cdc subcommands

Usage:

kn admin cdc create xyz.com --namespace test-ns
kn admin cdc delete xyz.com

/kind

Fixes #100

Release Note

Docs

[knative-prow-robot]

@vyasgun: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

In response to [this](https://github.com/knative-sandbox/kn-plugin-admin/pull/108): > > ># Changes >Added create, delete, and list commands for cluster domain claim resource > > >- For creating a domainmapping, the related cluster domain claim object needs to be created first. >- By adding this command, user doesn't have to switch to kubectl to create it. They can use `kn admin` commands for CDC management. >- TODO: Need to add unit/e2e tests > >Usage: > >``` >kn admin cdc create xyz.com --namespace test-ns >kn admin cdc delete xyz.com >``` > > >/kind > > >Fixes #100 > > > >**Release Note** > > >```release-note > >``` > >**Docs** > > >```docs > >``` > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[codecov[bot]]

Codecov Report

Merging #108 (4db0327) into main (0b2a78f) will increase coverage by 0.68%. The diff coverage is 88.63%.

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   79.98%   80.66%   +0.68%     
==========================================
  Files          20       24       +4     
  Lines        1029     1117      +88     
==========================================
+ Hits          823      901      +78     
- Misses        147      155       +8     
- Partials       59       61       +2     

Impacted Files	Coverage Δ
pkg/types.go	19.64% <0.00%> (-2.36%)	:arrow_down:
pkg/command/cdc/list.go	92.59% <92.59%> (ø)
pkg/command/cdc/create.go	92.85% <92.85%> (ø)
core/root.go	61.29% <100.00%> (+1.29%)	:arrow_up:
pkg/command/cdc/cdc.go	100.00% <100.00%> (ø)
pkg/command/cdc/delete.go	100.00% <100.00%> (ø)

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[rhuss]

@vyasgun sorry, I'm late to this PR but plan to give it a review after the release. In the meantime, could you please resolve the conflicts ? thx!

[vyasgun]

I haven't added docs yet so adding the hold tag.

/hold

[vyasgun]

/hold

[vyasgun]

/unhold

[dsimansk]

Thanks!

/approve /lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsimansk, maximilien, vyasgun

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/knative-sandbox/kn-plugin-admin/blob/main/OWNERS)~~ [dsimansk,maximilien] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment