Specify parameter source with templating?

[carolynvs]

One change in PEP003 is the use of template syntax in areas outside of the install/upgrade/uninstall actions. For example, when specifying a dependency's parameters you can use template syntax to set it

dependencies:
  requires:
    - name: mydb
      parameters:
        username: ${bundle.parameters.username}

Should we do the same for parameter sources? We could support the older syntax but document/encourage the consistent templating syntax going forward.

parameters:
- name: port
  source:
    dependency: mysvc
    output: port

parameters:
- name: port
  source: ${bundle.dependencies.mysvc.outputs.port}

ℹ️ Read PEP003 - Advanced Dependencies for context about how dependencies should work, design details, and notes about desired behavior.