AKE in-place update manager

In-place update is a capability extension that AKE adds to CAPI. It can update cluster and existing node configurations without rebuilding nodes.

The AKE in-place update manager includes InplaceUpdateMachineGroup and InplaceUpdateMachine Controller, and defines InplaceUpdateMachineGroup CR and InplaceUpdateMachine CR.

• InplaceUpdateMachineGroup CR is used to describe in-place update information of a node group. It corresponds to KubeadmControlPlane or MachineDeployment in CAPI and is responsible for updating cluster configurations and controlling the number of concurrently updated nodes.
• InplaceUpdateMachine CR is used to describe in-place update information of a single node. It corresponds to Machine in CAPI and is responsible for update operations on a single node.

The in-place update manager works with CAPI to coordinate configuration synchronization at all levels, ensuring configuration consistency across all dimensions from the management cluster to workload clusters, from clusters to node groups, and then to nodes.