feat: add sessions to zipline

[TacticalTechJay]

This should resolve #552.

This PR adds sessions, here's how it'll work

• a session's default lifetime will follow the cookie's expiration date of 2 weeks
• a daily interval for clearing out dead sessions
• changing the password to a user will invalidate current sessions for said user
• listing a user's own sessions in their manage user page

Oh and I may have changed the devcontainer a little :3

~~made this in a day xd~~