User search for leaderboard

[MesterMan03]

The new API supports a user id in the page query parameter of /api/lbpage, which can be used to find a user's entry, even if it's on the 500th page or something. To use it, just prepend the id with the letter i and pass it as the page parameter (example: http://localhost:8146/api/lbpage?page=i123456789098766).

This can be used to create a "user finder" for the leaderboard, which comes with following challenges:

• [ ] Create a search bar to accept user ids.
• [ ] Let's say we have page 1 and 2 loaded already and the user searches for an id which is on the 8th page. We have to jump there of course, but now there is a gap between page 2 and 8, how do we fill that out? (loading every missing page is a bad idea, what if we jump to the 1500th page?)
• [ ] (API) User IDs are very confusing, the client should accept usernames which the API converts internally.

[jonahlikescookies]

Since users are fetched before running, it should be fine to use client.users.cache.find((user) => user.username === username))?.id to convert usernames to user ids. Here is a screenshot of the API converting a username properly: