Provide a way to specify profile page paging state from URL query

[rinsuki]

Pitch

previously (before v4), public profile page /@user using URL query to paging it, like /@user?max_id=12345.

re-add this to WebUI and bring back ~v3's behaviour.

Motivation

It would be useful to find context of post. not everyone correctly points to context of posts by mention, thread or links.

previously I used a replace URL method: /@user/12345 to /@user?max_id=12345 or /@user?min_id=12345 then find context of post, but current WebUI not allowing it.

also it makes hard to read all posts of someone (like official accounts), since WebUI doesn't keep any state to URL, so If your browser crashed when reading posts, then need to re-start from latest post. which is not good to both (server and user) side, since user wastes time/bandwidth/CPU to find unread post, and server wastes CPU/memory/disk io/bandwidth to return useless API response.