Add timeline in the Auth screen upon success

[zackkatz]

• Add a configuration flag for whether to show a timeline of activity on Client site

If enabled, show a vertical "milestone"-like timeline of access to site, when it was granted, by whom, etc.

• Juaquin Rogers granted access to GravityView support at 1:30 AM on August 7, 2020
• GravityView Support logged-in at 2:30 PM on August 7, 2020
• GravityView Support revoked access on 3:32 PM on August 7, 2020

Just like this!

[inztinkt]

Nice, @zackkatz would you prefer to store this in a site_options array or a custom table? The former seems more reasonable.

[zackkatz]

Options array should be fine; we can see how clogged-up this gets…