Feat: WMTS Tile Grid & Source Projections

[RobertOrthofer]

Implemented changes

This PR brings the possibility to defined tile grids for WMTS sources as well as projections for sources, which could be relevant in this context.

To keep it simple, WMTS tile grid generation has been simplified to the bare minimum. Resolutions are created for all zoom levels, extent has to be defined on the layer level. XYZ tilegrid generation remains unchanged.

For now, this has only been tested for 3857 data, though other projections should work, as long as the projection is registered on the map.

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[santilland]

Awesome, thank you! Could you maybe add one example story? I tested also WGS84 and seems to work fine:

[
  {
      "type": "Tile",
      "properties": {
        "id": "customId"
      },
      "source": {
        "type": "WMTS",
        "url": "https://tiles.maps.eox.at/wmts",
        "layer": "s2cloudless-2018",
        "style": "default",
        "matrixSet": "WGS84",
        "tileGrid": {
          "tileSize": [128, 128]
        }
      }
    }
]

[lubojr]

Thank you very much for the updates!

[RobertOrthofer]

@lubojr thanks, let me know if your linked PR needs any further adaptations

[lubojr]

It is fine and working for integration in eodash (I've tested pasting the exported layer from eodash to the storytelling deployed in the netlify deployment of this PR and it worked fine) Thanks again for the swift additions.