[Enhancement] Allow passing values from one task to another task

[peterzhuamazon]

[Enhancement] Allow passing values from one task to another task
Or something similar to the GitHub Actions outputs or env_var.

tasks:
  - call: get-date@default
     id: task1
  - call: print-to-console@default
     args:
       text: ${{ task1.outputs.textString }}

Thanks.

[prudhvigodithi]

[Triage]
@peterzhuamazon can you please share this use case are we looking for any specific task ?

[peterzhuamazon]

Task1: Add issue to project (return item id)
Task2: Add field to item (using item id retrieved from Task1)

[peterzhuamazon]

The above is just one example, there a many similar ones you can find in github actions.

[peterzhuamazon]

This has been completed in the #39 PR.