Parse and present sessions user agent

[matrixbot]

This issue was originally created by @sandhose at matrix-org/matrix-authentication-service#2374.

Record user agent on sessions

• Record user agent on user_sessions
• Record user agent on oauth2_sessions
• Record user agent on compat_sessions
• Record user agent on oauth2_device_code_grant
• Record user agent on oauth2_authorization_grants (should we? we can infer who completed the grant from the oauth2_sessions.user_session_id)

Parse the user agent server-side:

• Parse common user agents (using woothee?)
• Parse client-specific user-agents for native clients
  • EXA
  • EA
  • EXI
  • EI
  • ED

Present them in the UI:

• Show the device infos on the compatibility sessions
• Show the device infos on the oauth2 sessions
• Show the device infos on the device code grant consent screen

[matrixbot]

This comment was originally posted by @sandhose at matrix-org/matrix-authentication-service#2374 (comment).

We've been doing that for quite some time now and the cover most important places