[GEP-33] Add Capability support

[aniruddha2000]

How to categorize this PR?

/kind api-change
/kind enhancement

What this PR does / why we need it:

This PR is part of GEP-33 Machine Image Capabilities

It adopts the introduced Cloud Profile Capabilities from Gardener. It offers a mechanism to define a relationships between MachineTypes and MachineImages to ensure only compatible amis are selected for a given MachineType. An example for a Capability is the CPU architecture that is added as the first mandatory Capability. The existing architecture field is planned to be removed eventually.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Breaking changes:

[ske-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[ske-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign nschad for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment