add MapScript provider for coverages

[tomkralidis]

Hi! Yes, I mean to add this ability of using tileindex and MapScript as a source for the OGC-API Coverages collections. May be is already available as a provider?
It will be very usefull as we have our DTM data split in different files.
May be something like this:

    providers:
        - type: coverage
          name: MapScript
        data: /data/dtm_index_all.shp
        options:
            type: MS_LAYER_RASTER
            tileindex: True
            layer: sample
        format:
            name: COG
            mimetype: image/tiff; application=geotiff; profile=cloud-optimized 

Originally posted by @CeciliaPH in #1930

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[CeciliaPH]

Hello!
Writing here in order to keep the issue open 👍