Allow sorting sessions by intensity

[Twixes]

Is your feature request related to a problem?

Currently it's hard to find out which user sessions in a particular day were most intense. Two useful metrics are Event count and Session duration, but they can't be sorted or filtered by.

Describe the solution you'd like

These columns could be sortable.

Additional context

User request via Papercups.

Thank you for your feature request – we love each and every one!

[Twixes]

We no longer have a sessions view the way we did.