[POC] Devfile format for Stack, Factory, Workspace API

[skabashnyuk]

Description

The goal of this task is to do some "Spike" in coding and thinking
how we can move forward with:

• Adopt devfile format for Stacks Adopt devfile format for Stacks #12924
• Adopt devfile format for Factories Allow building and running applications at workspace start with devfile v2 post start events #12925
• Adopt devfile format for workspaces configuration Adopt devfile format for workspaces configuration #12926

As a basic idea, we want to add new field Devfile at the same level as we have WorkspaceConfig
and allow defining Stacks/Factories/Workspaces either from WorkspaceConfig or from Devfile.

[sleshchenko]

Simple POC is done and the following demo shows that it is possible to create and start a workspace that contains Devfile and does not container WorkspaceConfig https://youtu.be/v8pyH51Oh7k
Next steps are:

• Add an ability to use Devfile as workspace configuration as alternative to WorkspaceConfig Add an ability to use Devfile as workspace configuration as alternative to WorkspaceConfig #13079
• Provide database layer storage and integrity of devfile as part of workspace
  Provide database layer storage and integrity of devfile as part of workspace #13075
• Make Theia respecting Devfile of a field of Workspace Make Theia respect Devfile of a field of Workspace #13112

[slemeur]

can those issue be linked to the che7 epics?

[sleshchenko]

@slemeur Added the first and the second under the corresponding epic for Platform Team.
The third one is not added because there is no team label yet but I'm not sure who will work on it. I guess IDE2

[slemeur]

tks