Add user events

[cesr]

Implementation

I'd love to use Posthog for this as it gives us a lot of precooked metrics

Events

• Sign up
• Log in
• Create project
• Create evaluation
• Run evaluation prompt
• Create dataset
• Add provider api key
• Invite user
• Create new project version
• Publish new project version
• Create folder
• Create file
• Run document prompt
• Connect evaluation to document
• Run batch evaluation
• Visit page
  • Path in metadata

[geclos]

#226

[cesr]

Reopening to move these events to the backend