📖 [WIP] Add proposal for independent worker topology versions

[AcidLeroy]

What this PR does / why we need it:
The purpose of this PR is to add "independent worker topology versions" to ClusterClass. This allows cluster vendors to continue to utilize ClusterClass, but enables them to have more fine-grained control over the K8s versions running in their worker node groups.

Which issue(s) this PR fixes
Fixes #12466

/area clusterclass

[linux-foundation-easycla]

• ✅login: AcidLeroy / name: Cody W. Eilar / (0610eff)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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[ivelichkovich]

for issue: #12466

[ivelichkovich]

lets mark as draft until we have some consensus on the google doc