Support OSM control plane deployment using a K8S operator

[nitishm]

Please describe the Improvement and/or Feature Request

Implement an OSM operator similar to istio operator to provide lifecycle management for multi-control plane deployments in a single cluster.
The functionality would be at par with the CLI but would give us the added benefit of configuring the CPs via Custom Resources versus maintaining and managing a configmap and have the operator constantly reconcile state to ensure that the control planes are always functioning correctly and are in the right state.
This saves the user from accidental misconfigurations of the control plane at deploy time or runtime (think validating webhooks).
Additionally, in an operator model, the user no longer needs to watch for events or log messages for each of the deployed control planes to triage and debug problems that could be caused by misconfiguration.
IMO the overall UX improves by having the operator manage deployments and upgrades.

Also see similar motivations here - https://istio.io/latest/blog/2019/introducing-istio-operator/#summary

The new istioctl commands and operator controller both validate configuration schemas and perform a range of checks for installation change or upgrade. These checks are tightly integrated with the tools to prevent common errors and simplify troubleshooting.

Scope (please mark with X where applicable)

• New Functionality [X]
• Install [X]
• SMI Traffic Access Policy [ ]
• SMI Traffic Specs Policy [ ]
• SMI Traffic Split Policy [ ]
• Permissive Traffic Policy [ ]
• Ingress [ ]
• Egress [ ]
• Envoy Control Plane [ ]
• CLI Tool [ ]
• Metrics [ ]
• Certificate Management [ ]
• Sidecar Injection [ ]
• Logging [ ]
• Debugging [ ]
• Tests [ ]
• CI System [ ]
• Project Release [ ]

Possible use cases
Provided in description above.

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Issue closed due to inactivity.