Retrieve Triggered/Continuous information for each channel

A field is present in stationxml : https://docs.fdsn.org/projects/stationxml/en/latest/reference.html#channel-type

And retrievable with Obspy in "types" field : https://docs.obspy.org/packages/autogen/obspy.core.inventory.channel.Channel.html#obspy.core.inventory.channel.Channel

But this field is likely to be removed in the future.

Furthermore, we should store this information in waveqc database and display triggered station accordingly in all visualizations (heatmaps and homepage)