enable simulator to use live telemetry data from ELRS

[offer-shmuely]

The problem

It is hard to debug script & widgets that talk to complex elrs communication like MSP

Describe the solution you'd like

I like to have ability to run the simulator with live elrs telemetry push/pop

The setup is as follow:

• TX is running with elrs module connected to a flight controller
• computer is connected to TX with usb (usb<-->TX)
• simulator is running lua code in widget or one-time script

requested feature:

• when the code that run in the simulator call crossfireTelemetryPush(), it will be send to elrs module on the TX through the usb
• when the code that run in the simulator call crossfireTelemetryPop(), it will be read from the elrs module on the TX through the usb

[wimalopaan]

Since we have already a connection to a physical serial port in simulator another possiblility would be to allow the simulator use an external connected ELRS-Module directly.