feat: add "first" scope to get_player_scores

[minisbett]

Describe your changes

Adds the "first" scope for first-place scores to the API v1, as the API v2 does not contain any implementation for this kind of stuff yet.

Checklist

• I've manually tested my code

[tsunyoku]

ignoring the fact i see this becoming SHIT slow on maps with many scores, this needs consideration/ignoration for restricted users as their first places should not count

[minisbett]

ignoring the fact i see this becoming SHIT slow on maps with many scores, this needs consideration/ignoration for restricted users as their first places should not count

wait didnt I already add that to the query nvm

[tsunyoku]

i still think this would be a nice feature to get in, however i'm still concerned about performance - we should be using an intermediary table that is inserted to on score submission if score.rank == 1 with a script to back-fill this table. this is going to be quite involved as there's events which might trigger changes to these - right now i can only think of (un)restriction. @minisbett would you be happy to do something along these lines?