Description
SIS has a list of TIFF tags in package-privete org.apache.sis.storage.geotiff.Tags class. Since Java 9, the javax.imageio.plugins.tiff package provide the same functionality. The standard package is richer in term of tag information (name, values, etc.); using it would both remove unnecessary duplication and allows richer GeoTIFFStore.getNativeMetadata() result.
This issue depends on the migration to Java 9, which must be done first.