Add ability to pass in an array variable or template for dropdown field options, or variables/templates for each item, and allow separate selection values and labels

[BLoe]

In the form editor, a for dropdown-type-field's options, allow the following:

1. Pass in an array variable containing all the option strings
2. Pass in an object variable, using the keys as enum and the values as enumNames in the json-schema (maybe this should be opposite with how keys/values are used?)
3. Use a (string) variable for one of the options
4. Set a template string for one of the options
5. Allow hard-coding text for separate option-value and display-label (enum vs enumName in json-schema) for an individual option
6. Allow passing in variables for the value and label for an individual option
7. Allow setting string templates for the value and label for an individual option
8. Allow passing in two array variables at the top level, one for enum and one for enumNames, with the array order dictating which value goes to which name.