Implement generate MachineDeployments and their referenced objects for a managed topology

[fabriziopandini]

Detailed Description

This is part of the activities for the implementation of the ClusterClass proposal.

This is a spin of off #4998

As part of the ManageTopologyController reconcile loop, we want to generate the desired state of a managed topology.

This issue focus machine deployments and related templates (cluster and its dependencies are already addressed by This is a spin of off #4998).

Also, please note that implementing support for version upgrade component by component will be addressed in a follow up step.

** Anything else you would like to add: **

This issue assumes #4933 and #4986 to be merged first

Same comments of #4998 applies

/kind feature

[fabriziopandini]

/milestone v0.4

[fabriziopandini]

FYI #5002 implements the first part of this effort

[srm09]

/assign

[fabriziopandini]

@srm09 let's introduce a new cluster.x-k8s.io/topology/machine-deployment-name label to track the name from cluster.topology.workers.machineDeployments[].name on the generated deployments

[sbueringer]

/area topology