JSON TileMatrixSet parser: accept crs.uri and crs.wkt encodings

[rouault]

Fixes #10989

[jratike80]

I understood from the standard that the wkt option means a projjson string.

[rouault]

I understood from the standard that the wkt option means a projjson string.

yeah, that's highly confusing, and I suppose in high flux given how uncertain PROJJSON future is at OGC, given they are likely to fork it in a backwards incompatible way to create a OGC CRSJSON: https://github.com/opengeospatial/CRS-JSON-Encoding
In any case, be it WKT or PROJJSON, this will work with this PR as this is passed downstream to OGRSpatialReference::SetFromUserInput() which accepts both.

[jratike80]

Ok, good. The standard anticipates the future:

NOTE This Standard adopts the https://proj.org/specifications/projjson.html encoding, pending a resolution in the CRS group for adopting a possible future JSON encoding for WKT for CRS 2.0

[coveralls]

coverage: 69.445% (-0.001%) from 69.446%
when pulling b979373 on rouault:fix_10989
into 6cf71ee on OSGeo:master.