add external hcloud cloud controller manager

[oujonny]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it: This PR add hcloud as external cloud provider. It include a new role which installs the hcloud cloud controller manager. https://github.com/hetznercloud/hcloud-cloud-controller-manager

Which issue(s) this PR fixes:

Fixes #8285

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add hcloud as external cloud provider

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Johann Schley (8028062)

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[cristicalin]

Thanks for the contribution @oujonny !

/ok-to-test
/lgtm

[oomichi]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oomichi, oujonny

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