[FEATURE] Workflow Instantiation - GET template endpoint

[malexanderlim]

Is your feature request related to a problem? Please describe.
User is creating CI/CD for workflows and components.

Describe the solution you'd like
Request is to be able to get a workflow's template via API (e.g. tch_id, payload)

Do you have a workaround?
Have to "Instantiate via API" from workflow builder.

Comparable features in other tools?
n/a

Additional context