Add a filter for inactive sessions

[sandhose]

This is reviewable commit by commit:

• Add an index on the last_active_at column of the sessions tables
• storage: add a filter by last active time on browser sessions
• storage: add a filter by last active time on compatibility sessions
• storage: add a filter by last active time on OAuth 2.0 sessions
• storage: add a filter by last active time on app sessions
• graphql: allow filtering of sessions by last activity
• frontend: add filter for inactive sessions

This adds a filter to only show sessions that have not been active for more than 90 days.

It also reworks a bit the session list to make it clearer that the browser session thing is separate.
On the frontend side, it isn't exactly what's designed, because:

• the menu component in compound is lacking
• we can't really merge the 'browser' sessions and the 'app' sessions

Fixes #2219
Helps with #2265

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[reivilibre]

On the frontend side, it isn't exactly what's designed, because:

just for ref, do you have a link to the designs / an issue, in case we need to look back on this in the future?

[reivilibre]

this seems fine to me. Glad we split up the filters like that

[reivilibre]

I think this is what gets generated as the GraphQL documentation right?

I think we should describe the format of the date here, since it's not obvious how a caller should use it.

I then wonder how much we care about timezones. Possibly not at all, given 90 days is far enough away that it probably doesn't matter whether it's a few hours off.

[sandhose]

The scalar used is a custom one, which is serialises as a string, and has the following (autogenerated) documentation on it:

"""
Implement the DateTime<Utc> scalar

The input/output is a string in RFC3339 format.
"""
scalar DateTime

so that's probably fine?

[sandhose]

just for ref, do you have a link to the designs / an issue, in case we need to look back on this in the future?

You're right, for the feature itself that would be #2219

The designs are here: https://www.figma.com/design/HUysJAhv6cK6p1Pc81Fxaa/Matrix-Authentication-Service-(MAS)?node-id=4352-32522&t=lqvaJRtBgVVCC7Ix-4

Tracking issue for the designs: #2265