Improve CoverageJSON Ecosystem 4: STAC Browser support

[chris-little]

@jonblower thinks CoverageJSON could be a useful format for an "asset" in a STAC catalogue. STAC can point to pretty much any format (using the media type, which is one reason why #135 is important). So GeoTIFFs and CoGs can already be arranged in a STAC catalogue.

He thinks nothing further needs to be done to integrate CoverageJSON with STAC as they are neatly complementary. But it would be cool to build in some CoverageJSON visualisation into the STAC browser so data can be automatically previewed, in the same way that GeoTIFF can be.