Enable user-defined labels for Compose outputs

[ONYXJas]

The Compose Action currently produces a single output field labelled - very helpfully - "Output".

This effectively limits its use to a single step/single output in a workflow, which is useful... but there are some instances where it would be even more useful to be able to have several composed outputs, each identifiable by name, to use in subsequent steps.

Please enable the Compose step to produce multiple outputs, with user-defined labels for each one.

The Compose step should also be able to be used multiple times and at different points within a Flow, with the unique outputs from each Compose step separately identifiable in the Dynamic Content list.