Display an "effective" view of the Devfile

[rm3l]

/kind user-story

DevTools week idea.

User Story

As an odo user, I want to view the effective Devfile that will be used by odo So that I can have a better understanding of what odo will do.
An effective Devfile is a view of the Devfile after all resolutions have been performed by odo. This includes things like:

• variable substitution
• parent flattening
• image names as selector replacements
• pod/container overrides applied
• ...
  This is kind of similar to the idea of a dry-run option (mentioned in As a user, I need guidance on how to add devfiles to existing apps (odo init --dry-run -o yaml) #4435, odo dev --dry-run #5243 or odo deploy --dry-run #6240), but mostly focused on the Devfile view.
  It could be available as an odo print (or something similar) command.

Acceptance Criteria

• It should print the effective Devfile view after all patching is done
• It should error out if there is no local Devfile
• It should accept --var and --var-file flags to perform variable substitutions

Links

• Related Epic (mandatory):

/kind user-story

[github-actions]

A friendly reminder that this issue had no activity for 90 days. Stale issues will be closed after an additional 30 days of inactivity.

[github-actions]

A friendly reminder that this issue had no activity for 90 days. Stale issues will be closed after an additional 30 days of inactivity.