Passthrough for Betaflight MSP SET_NAME commands

[jappyjan]

What does this add? This PR enables the transmission of Betaflight SET_NAME MSP commands for setting the "Craft Name" field via ELRS. see this PR for reference: https://github.com/ExpressLRS/ExpressLRS/pull/2504

Why should we add this? In order to support (e.g.) racetimers sending lap time information and other messages to the OSD, currently Betaflight does not (yet) support such information in a native way so we "abuse" the craft name field (like DJI V1 did ^^). Once Betaflight supports this type of information we will refactor to use whatever new logic will be there...

Any reference to how this will/is beeing used? I am working on an extension/PR to this RotorHazard plugin, which displays lap time information in FPV Goggles using a variety of techniques. https://github.com/i-am-grub/VRxC_ELRS

This is my Fork, though its not yet 100% complete, therefore no PR exists yet. https://github.com/UAV-Painkillers/VRxC_ELRS

This is the related ExpressLRS PR https://github.com/ExpressLRS/ExpressLRS/pull/2504