Support GPX and NMEA files

**Is your feature request related to a problem? Please describe.**
I'd like to be able to load GPS trace files into kepler.gl.

**Describe the solution you'd like**
Would be nice to be able to directly load GPX and NMEA log files in Kepler.

**Describe alternatives you've considered**
It's very possible to use other OSS tools to process these files into other formats (like lat/lng CSV), but this requires going through some other tools and knowing how to transform these files.

**Additional context**
I should be able to provide some sample GPX or NMEA files if needed and you can't find any online.
I noticed GeoDataViewer for VS Code which uses kepler.gl supports GPX but not NMEA.