[REQ] zapier: createAction middleware

[a-wallen]

Is your feature request related to a problem? Please describe.

Creates should have a middleware to transform the value, just like searchMiddleware.

Here are two use cases where such a middleware would be helpful.

1. Filtering fields from the object that aren't relevant for Zapier users.
2. Making a field's value a dynamic drop-down.

Describe the solution you'd like

Implement the createAction middleware just like the searchMiddleware