Nyall Dawson 4d442441f8 [sensorthings] Add support for Multidatastreams
This adds support for the Multidatastream entity type, as
implemented in the SensorThings version 1.1 "MultiDatastream extension"

While the specification mandates that MultiDatastreams have an
optional polygon geometry, I've encountered numerous servers
which expose different geometry types for this entity or which
return errors when attempting to read the geometries from
MultiDatastreams. Accordingly we always expose an option to
load MultiDatastreams as geometryless layers alongside the
default option to load them as polygon layers, to handle a
wider range of connections.
2024-03-25 19:16:56 +10:00
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