Implement `run bundle` subcommand to improve OLM integration

[jmrodri]

The Operator SDK maintainers are hard at work to implement run bundle to improve integration with the Operator Lifecycle Manager.

The purpose of this issue is to communicate with the community what will be in run bundle.

TODO

• create registry image pod ([run bundle]: Create bundle registry server #3337 , [run bundle] Use controller runtime client to create registry pod #3665 )
• rebase / update operator-group-install-mode branch
• scaffold out structs from diagram to start (internal/operator-sdk/run|cleanup: initial boilerplate #3636)
• implement Config struct, refer to kubectl operator plugin and cobra "prerun" (internal/operator-sdk/run|cleanup: initial boilerplate #3636)
• implement RunBundle and tie CLI to call OperatorInstaller (internal/operator-sdk/run|cleanup: initial boilerplate #3636)
• connect run bundle to the Operator SDK CLI (internal/operator-sdk/run|cleanup: initial boilerplate #3636)
• create grpc catalogsource ([run bundle] Implement IndexImageCatalogCreator - create grpc catalog source  #3467, [run bundle] refactor catalog source and registry pod creation #3832 )
• implement OperatorInstaller (internal/olm: refactor package internal/operator and run packagemanifests logic #3764, [run bundle] Install plan generation and approval for subscription #3838)
• implement IndexImageCatalogCreator (create CatalogCreator interface) ([run bundle] Implement IndexImageCatalogCreator - create grpc catalog source  #3467)
• implement PackageManifestCatalogCreator (maybe) (internal/olm: refactor package internal/operator and run packagemanifests logic #3764)
• update OperatorGroup logic to handle install mode for run bundle (run bundle: OperatorGroup Install modes #3861)
• create Subscription logic (internal/olm: refactor package internal/operator and run packagemanifests logic #3764, [run bundle] Install plan generation and approval for subscription #3838)
• verify operator is installed/upgraded ( run bundle: Verify operator is installed/upgraded #3766 run bundle: Add deployment status check when verifying installed operator. #3819)
• write e2e test for run bundle and enable run bundle CLI ([run-bundle] Test example scenarios for run bundle #3844 [e2e-test] Add run bundle to e2e test #3831)

Reference information

• run bundle enhancement which describes the CLI to be implemented
• run bundle upgrade enhancement
• kubectl operator plugin

Proposed design:

[jmrodri]

run bundle is now in the operator-sdk.