[Feature] add Time dimension support to WMTS catalog item type

[ashleysommer]

Currently the WMS Catalog item allows Time-dimension support (aka WMS-T protocol extension), but the WMTS (Web Mapping Tile Service) Catalog item does not have the ability to enable time-dimension feature in TerriaJS.

For an example of a WMTS service endpoint that has an enabled Time dimension, see here: https://landscapes-mapserver.tern.org.au/mapcache/wmts/?service=WMTS&version=1.0.0&request=GetCapabilities

Note, in this case "time" is the only additional dimension, and the ResourceURL Template looks like this:

https://landscapes-mapserver.tern.org.au/mapcache/wmts/1.0.0/ETaScaled/default/{time}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}.png

Every available possible point in time is listed in the GetCapabilities response, so seems like enabling support for time dimension would be relatively simple.