Feat: add cluster-api-provider-kubekey

[24sama]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Follow the cluster-api guide, and use the kk way to implement the provider as an infrastructure, which is named cluster-api-provider-kubekey, aka capk. We defined three CR.

• KKCluster: Contains information about the nodes on the cluster that capk needs. Like node's IP address, node's ssh auth.
• KKMachine: Contains the roles of this machine. Its controller will request the corresponding node ssh information from kkcluster based on the roles and use that information to create a kkinstance.
• KKInstance: Abstracts the concrete machine, and its controller will perform operations on the corresponding node based on the ssh information in the spec.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Does this PR introduced a user-facing change?

Additional documentation, usage docs, etc.:

• Cluster-API provider

[24sama]

/cc @kubesphere/sig-installation

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 24sama

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[pixiake]

/lgtm

[ks-ci-bot]

LGTM label has been added.

Git tree hash: a7ae27b113d32b22c8773f118358dbb844d17184