GTI: make the driver work with STAC GeoParquet files that don't have a assets.image.href field

[rouault]

Fixes #11317

Note that this fixes the GTI issue only. But https://planetarycomputer.microsoft.com/api/stac/v1/collections/io-lulc-annual-v02/items/60L-2017 references files such as https://ai4edataeuwest.blob.core.windows.net/io-lulc/io-annual-lulc-v02/60L_20170101-20180101.tif that require authentication, and the driver has no clue how to do that

[scottyhq]

references files such as https://ai4edataeuwest.blob.core.windows.net/io-lulc/io-annual-lulc-v02/60L_20170101-20180101.tif that require authentication, and the driver has no clue how to do that

At least for planetary computer data there is already an environment variable for url signing... but not sure at first glance of an existing way to either modify asset hrefs on the fly or apply environment variable settings to the items within a catalog rather than the catalog itself?

GDAL_DISABLE_READDIR_ON_OPEN=EMPTY_DIR \
VSICURL_PC_URL_SIGNING=YES \
gdalinfo /vsicurl/https://ai4edataeuwest.blob.core.windows.net/io-lulc/io-annual-lulc-v02/60L_20170101-20180101.tif

[rouault]

At least for planetary computer data there is already an environment variable for url signing

Doh, I almost forgot I code that thing...
ok, so putting all pieces together:

$ GDAL_DISABLE_READDIR_ON_OPEN=EMPTY_DIR VSICURL_PC_URL_SIGNING=YES AZURE_STORAGE_ACCOUNT=pcstacitems AZURE_STORAGE_SAS_TOKEN=`curl -s https://planetarycomputer.microsoft.com/api/sas/v1/token/pcstacitems/items | jq -r '.token'` gdalinfo GTI:/vsiaz/items/io-lulc-annual-v02.parquet  -oo SRS=EPSG:4326
Driver: GTI/GDAL Raster Tile Index
Files: none associated
Size is 112521, 51274
Coordinate System is:
GEOGCRS["WGS 84",
    ENSEMBLE["World Geodetic System 1984 ensemble",
        MEMBER["World Geodetic System 1984 (Transit)"],
        MEMBER["World Geodetic System 1984 (G730)"],
        MEMBER["World Geodetic System 1984 (G873)"],
        MEMBER["World Geodetic System 1984 (G1150)"],
        MEMBER["World Geodetic System 1984 (G1674)"],
        MEMBER["World Geodetic System 1984 (G1762)"],
        MEMBER["World Geodetic System 1984 (G2139)"],
        MEMBER["World Geodetic System 1984 (G2296)"],
        ELLIPSOID["WGS 84",6378137,298.257223563,
            LENGTHUNIT["metre",1]],
        ENSEMBLEACCURACY[2.0]],
    PRIMEM["Greenwich",0,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[ellipsoidal,2],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[1],
            ANGLEUNIT["degree",0.0174532925199433]],
        AXIS["geodetic longitude (Lon)",east,
            ORDER[2],
            ANGLEUNIT["degree",0.0174532925199433]],
    USAGE[
        SCOPE["Horizontal component of 3D system."],
        AREA["World."],
        BBOX[-90,-180,90,180]],
    ID["EPSG",4326]]
Data axis to CRS axis mapping: 2,1
Origin = (-180.000000000000000,84.032571314409978)
Pixel Size = (0.003199422625477,-0.003199422625477)
Corner Coordinates:
Upper Left  (-180.0000000,  84.0325713) (180d 0' 0.00"W, 84d 1'57.26"N)
Lower Left  (-180.0000000, -80.0146244) (180d 0' 0.00"W, 80d 0'52.65"S)
Upper Right ( 180.0022332,  84.0325713) (180d 0' 8.04"E, 84d 1'57.26"N)
Lower Right ( 180.0022332, -80.0146244) (180d 0' 8.04"E, 80d 0'52.65"S)
Center      (   0.0011166,   2.0089735) (  0d 0' 4.02"E,  2d 0'32.30"N)
Band 1 Block=256x256 Type=Byte, ColorInterp=Palette
  NoData Value=0

[coveralls]

coverage: 73.708% (+0.007%) from 73.701%
when pulling 316c8a4 on rouault:fix_11317
into 5a7aac3 on OSGeo:master.