Add scripting commands to DeviceApiTester

[shaggygi]

This is a placeholder for discussions related to scripting commands using the DeviceApiTester. There is an initial PR #101 as a starting point.

1. What other commands/attributes could be added that would be helpful related to scripting?
2. Would support for Visual Basic and F# language be useful? Is it possible?
3. Should this be added to DeviceApiTester README?

[shaggygi]

The new dotnet/command-line-api mentioned a section on scripting capabilities. Not sure if/how this could be used if migrated.

[shaggygi]

Not sure when VB option will be available. See dotnet/roslyn#13523

[shaggygi]

script-run works well for now for C#. Not sure when VB scripting APIs will be added back. Closing for now, but will check periodically to see if VB can be added later.