Feature request: GEDI flags should be unpacked

[jpswinski]

From @dshean

Function to unpack the returned flag bits and prepare a tuple of 0/1 or other integer values for each:
"flags": flags set for footprint (0x01: degrade, 0x02: l2 quality, 0x04: l4 quality, 0x80: surface) (edited)

[dshean]

Thanks for posting!
Better yet, we could unpack into dictionary with labels {'degrade':0, 'l2_quality':1...} and store in the GeoDataFrame "flags" column.

[scottyhq]

I'm not sure what the current values are in the "flags" column are (coming from gedi.gedi02ap): I see 130, 131, which don't correspond to hex numbers listed in the docs... I'm pretty sure it is the sum of flags? So 131 -> is_suface + not_degraded + meets_quality

related issues/discussion https://github.com/orgs/SlideRuleEarth/discussions/442, #446