Pull application from cluster (Devfile as a ConfigMap in the cluster)

[rm3l]

User Story

• As on odo user
• I want to be able to import/pull application running on the cluster (I don't have it's devfile, and I don't know where the source code is)
• So that I can make changes to the application and run it with my changes

Acceptance Criteria

• It should sync the Devfile content to a ConfigMap in the cluster
  - [ ] It should watch for changes to this ConfigMap and handle them in its reconcile loop
• This ConfigMap should be the parent Kubernetes owner object of all the other objects odo creates (Deployments, Services, ...)
• This ConfigMap should be used whenever we need to retrieve all Kubernetes objects that pertain to the Devfile
• Leave room for extension in the ConfigMap spec
• Make sure the naming scheme allows to store this in a shared namespace. Naming scheme should be consistent with what will be done in Allow multiple odo users share one namespace #5862
• Update odo delete logic to use this
• Make sure Devfile changes are handled even if the devfile.yaml is Git-ignore'd. For example, changes to the commands in the Devfile should cause the commands to be restarted in the container. See odo dev: react to changes as soon as possible #5933 (comment)
• It should also not break the --no-watch flag

Notes

• side effect odo codebase could be simplified (e.g., ownerReferences / deletion handling, selecting all dependent resources)

- Use new approach based on reconcile loop POC: https://github.com/feloy/odo-dev-controller-poc

Links

• Related Epic (mandatory): [Epic] Address user feedback #5848
• Parent User Story: odo dev needs to handle changes in devfile.yaml #5728

/kind user-story

[cdrage]

Blocked by #5933

[valaparthvi]

This is be helpful with #6453 for describing details that we abstract from the Devfile.