🏃Add baremetal provider in clusterctl pre-defined providers list

[maelk]

What this PR does / why we need it:
This PR adds the baremetal infrastructure provider to the clusterctl pre-defined list of providers.

Which issue(s) this PR fixes:
Fixes #2356

[k8s-ci-robot]

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[vincepri]

/approve
/assign @fabriziopandini
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maelk, vincepri

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[fabriziopandini]

@maelk after adding a provider, also Test_clusterctlClient_GetProvidersConfig should be fixed. see this PR https://github.com/kubernetes-sigs/cluster-api/pull/2253/files as example-

Additionally, have you considered to:

• add embedded metadata as well here?
• add quick start instructions here?

[maelk]

Thank you for the feedback. I added the missing pieces and fixed the tests. Currently the overview points to a getting-started.md that is WIP. It will be added in CAPBM very soon.

[fabriziopandini]

@maelk
only one nit, then ok for me

[vincepri]

/lgtm