Create Suricata Alert View

[jameskerr]

I don't have sample data where we have alert-2 and alert-1s, but the colors should change from yellow to orange to red based on the severity.

I didn't re-order the columns like we used to. It's not clear how to do it in a clean way. Maybe we can revisit if the need comes up again.

fixes: #2738

[philrz]

I've tested out the branch with a wrccdc pcap and have attached a video with it showing alerts at all three numeric levels with different colors. Looks good to me.

Alerts.mp4

I think it's ok with the columns in the order you have them now. The event_type field is far enough "leftward" in the shaped records that they still show up in the main events view without scrolling right, which helps a lot. It could be moved by changing the field order in the shaper that Brimcap applies to the Suricata data, so I'll look at doing that as a separate effort.

I see that CI has some grump about lint, so I'll hold off on clicking Approve until that's green.