* Tools: rewrite uploader script
This adds a script called px4_uploader.py which is a complete rewrite
using Claude Code of px_uploader.py.
The main improvements over the previous px_uploader.py script are:
- Separate smaller classes instead of one big uploader class.
- Easier debugging with --verbose or --debug flags.
- Nicer progress animation.
- No more hard to debug Exception swallowing over multiple levels.
- Auto-detection and looping of devices, removing the functionality from
cmake.
- Auto-detection of PX4 devices by USB VID/PID.
- Add noninteractive mode
- Add JSON output mode
