Add Values to Mask

[wildintellect]

Is your feature request related to a problem? Please describe.
The LINCI file is a bit mask layer. Those values correspond to classes that should be documented.
Value Category
0 No data
1 Valid data
2 Layover
3 Shadowing
4 Ocean Water
5 Invalid data

https://www.eorc.jaxa.jp/ALOS/en/dataset/pdf/PALSAR2_CARD4L_L2.2_Geotiff_Format_Description_E_20220715.pdf

Describe the solution you'd like
Check for a STAC extenstion to handle class value defining.

Describe alternatives you've considered
Do nothing and have users follow the metadata to the description file.