Retrieve and stub Actions / (Workflows) to by-pass XrmQuery.promiseRequest

[mkholt]

Is your feature request related to a problem? Please describe.
When calling a workflow of type Action from TypeScript, one needs to use the promiseRequest function, hard-coding the name of the action, and having to look it up.

This leads to possible issues by mis-typing, and if the name changes.

Additionally, promiseRequest accepts a parameter of type object, which secretly has to be a stringifyed JSON object.

Describe the solution you'd like
The context generator should create stubs for any actions found, with defined types for the input and output parameters for the actions.