Draft: POC - interpolation to use local context data

What does this MR do and why?

This is just for a general idea for how interpolation with local context data can work.

Ignore the code, tests, etc.

References

Components - Allow interpolation to use local c... (#438275)

Screenshots or screen recordings

Test component file:

# templates/test-component.yml

spec:
  context: [component, pipeline, project]
  inputs:
    a:
      default: a
    b:
      default: b
    c:
      default: c
---
link-check:
  script:
    - echo "$[[ inputs.a ]] $[[ inputs.b ]] $[[ inputs.c ]]"
    - echo $[[ context.component.name ]]
    - echo $[[ context.component.version ]]
    - echo $[[ context.component.sha ]]
    - echo $[[ context.pipeline.ref ]]
    - echo $[[ context.project.full_path ]]
    - echo $[[ context.project.id ]]

Main CI file to test

include:
  - component: $CI_SERVER_FQDN/$CI_PROJECT_PATH/test-component@$CI_COMMIT_SHA

Result:

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