📖 [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[bot]]

• :white_check_mark:login: AcidLeroy / name: Cody W. Eilar / (0610effd49f231101652c6754781a36ab6ceb03f)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

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[ivelichkovich]

for issue: https://github.com/kubernetes-sigs/cluster-api/issues/12466

[ivelichkovich]

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

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/lifecycle stale

[AcidLeroy]

/remove-lifecycle stale

[AcidLeroy]

Working on the collaborative document here: https://docs.google.com/document/d/1coeDs0DyHSUh1OuHtmcxnqSK_oaQ_qAJzgMkW7pLYK4/edit?usp=sharing

Please leave any comments.