[Amplitude] Page view and session tracking client side

[lasryaric]

Description

I was a bit unsatisfied with the current state of the Amplitude tracking, for a few reasons:

• The groups tracking dimension was poorly done, the API / SDK was a bit hard to make sense of initaly.
• We were not tracking any information that was not in our DB already, making Amplitude only a better UI for analytics.

This PR adds 2 things:

• User session tracking on the front end.
• Page view tracking for nearly all the logged in pages.

Clean workspace tracking to lookup a workspace activity (group dimension) is done in a separate PR.

Risk

Deploy Plan

[lasryaric]

PMRW