Collect parameters in use in current script

## User Story

As a user I want to be able to test my script as I am creating it, but if I am using params, I don't have an easy way to test unless I hardcode the values in place of where I would normally use a parameter\. When invoking the script via API, I will be passing the parameters, but when using the script editor to build and test my script, I wouldn't be able to do that so I want the editor to look at my script and gather a list of params in use\.

## Acceptance Criteria

- When a user starts to run a script, the software will look through the script to gather a list of params and their names that appear in the script\.

## Notes

- Doing something with these parameters are defined in a separate story

- Vinay states we may be able to pull this from the query via API, but that will require that the script be saved of course:  `/api/v2/scripts/{scriptName}/params`

- We could use that instead of reading through the script, but we would need to force the user to save the script first