API management refactoring.

[digimaun]

Primary purpose of the PR is to simplify API management.

Highlights:

• Refactor out of having to provide resource kinds per EdgeResourceApi instantiation. Instead EdgeResourceApi will determine resource kinds based on group/version against the target cluster.
• Removed EdgeResource. Let's see if we really need that abstraction.
• base cluster interaction functions do not have dependency on EdgeResourceApi or EdgeResource

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