Add a control for dictionary types in the node properties panel

[kiersten-stokes]

Is your feature request related to a problem? Please describe.
With the support for BYO catalog types, what is currently the Component Source property in the node properties panel must change from a generic string indicating a url or path to a dictionary of key-value pairs that indicate where that component specification file can be found.

e.g., the new version of Component Source should be able to support the following format (as received in the properties JSON for a component)

{
  "hostname": "http://localhost",
  "port": "8000",
  "component_id": "filter-text"
}

Describe the solution you'd like
The new control should be able to display a dictionary with string-valued keys and string values. This also needs to be read-only; a user should not be able to edit anything in this property.