[improvement] add per session view

Hi

In real time view, you can click on "visitor" which means database "per session id" related traffic.

Can we imagine a new ui-view for a given session id ?
• It would focus on page view and events for a given session
• the goal is to analyse/understand one enduser-session UX-experience.


And in addition to go deep we could imagine an optional "get session info" url extension to configure per site:
• on umami sessionid clic: does website have "get session info" url ?
• (if yes) send session Id, and get target website username : enrich ui with real target website username