Support highly available CAPI management components across clusters.

User Story

As an operator I would like to be able to configure redundant Cluster API components across clusters for automatic failover of workload cluster management.

Detailed Description

In a failure scenario where a management cluster is not functioning or inaccessible, remediation is mostly manual. In production deployments that rely on CAPI to back a mid-tier for cluster lifecycle operations this could mean unacceptable downtime. I believe an active-passive configuration with automatic failover is more feasible in the short-term. An active-active configuration could help support load balancing efforts for environments with a higher number of cluster CRUD requirements.

Anything else you would like to add:

If the user story is achievable now this may just need documentation. Otherwise I suspect this functionality would require a larger KEP but I'm familiar with that process.

[Miscellaneous information that will assist in solving the issue.]

/kind feature