add additional and higher resolution basemap types to Google Basemaps

[lemonjesus]

added two additional types of basemaps that can be rendered from Google: Hybrid (Satellite + Map) and Terrain.

there are some other more niche map types documented here - but these probably aren't useful for basemaps. a particularly interesting one, however, is the "Terrain Only" option which seems to provide a relief map of the terrain that might work in normal maps, but I haven't tried this out. I've left it out of this PR.

additionally, I've added support for higher resolution basemaps. Google's tile server will serve scaled-up map tiles in higher resolutions:

as you can see, these provide no additional detail, but are rendered at a higher resolution before they're rasterized. this is useful if you want the detail-level of a further-out zoom level, but you need higher resolutions for zooming into said rasterized map without loss of quality.

tested in Blender 3.1.2