Add provider for kcp

[waltforme]

What type of PR is this?
/kind feature

What this PR does / why we need it:
This PR adds a provider for kcp, a prototype of a Kubernetes API server.

Special notes for your reviewer:
By default, kcp's apiserver doesn't know nodes out of box. This introduces some specialty. For examples:

• We prompt the user to create the nodes.core CRD which is available from kcp;
• We directly returns in the implementation of RunSSHCommand.

Does this PR introduce a user-facing change?:

None

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: waltforme / name: Jun (d8684bb)

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/lifecycle stale

[waltforme]

/remove-lifecycle stale

[marseel]

/assign

[marseel]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marseel, waltforme

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• clusterloader2/OWNERS [marseel]

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