Init of basic snap (BEAM-DIMAP) ingest functionality #101
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Add prep_snap which is based on prep_isce and prep_roipac that extracts metadata from interferogram/coherence/unwrapped/elevation .dim (BEAM-DIMAP format) files produced by ESA SNAP and writes a RSC file in ROIPAC format in the same folder as the .dim file. HEIGHT and EARTH_RADIUS are extracted from orbit parameters using code adapted and simplified from ISCE2.
Furthermore snap is added as processor in load_data.
This update does not finalize SNAP integration - the next issue will likely be to read the data in the .data folder using mintpy.utils.readfile since the data (in envi format) is in a .data folder one level deeper than the asociated .dim / rsc files.