Add filtering by scan number for the same IRIS observation

[kakirastern]

Is your feature request related to a problem? Please describe it:

Seems when using the file importer (as opposed to the directory importer), the IRIS observation contained in the directory when loading is not being filtered by the scan number for a multi-scan IRIS Level 2 raster dataset.

Describe the solution you'd like:

Would like to see some filtering by scan number in addition to by the existing OBSID, as in the case of loading with the directory importer.

Additional context:
Currently if loading files into glue using the file importer, this is what one sees:

The desirable option is to have the data filtered by the scan number, as in the case of loading the data in with the directory importer: