LidarBC DEM downloads

[smnorris]

Proof of concept: bcgov/bcmaps#99 (comment)

If possible, it would be nice to work this into the bcdata dem command, perhaps switching between the default WCS DEM and the lidar files with a new source option. Not sure how practical all the other bcdata dem options are to apply to the lidar download, they are mostly offloaded to the server with WCS requests.

@TomasMillaKoch
@nickw-CWF

[smnorris]

It is hard for me to believe nobody has already set up a STAC for the lidar derived DEMs.

Searching GH, this seems relevant but it seems to only be a starting point: https://github.com/stactools-packages/bc-dem