Support alternative leaderboard services

[ErisApps]

Basically what the title implies, support services other than ScoreSaber so that people who don't wanna use ScoreSaber don't have to...
This includes, but not exhaustive

• AccSaber
• BeatLeader
• Hitbloq
• (Other custom leaderboard services...)

Will require some rework in how the current commands work, maybe completely switch over to slash commands and use command groups instead? (See #177 and #257)

[ErisApps]

AccSaber endpoints:
https://api.accsaber.com/categories - Returns the categories they have
https://api.accsaber.com/categories/{categoryName}/standings - Category standings
https://api.accsaber.com/ranked-maps - All Ranked Maps
https://api.accsaber.com/ranked-maps/{leaderboardId} - Returns a specific leaderboard - also works by hash (ScoreSaber leaderboard ID)
https://api.accsaber.com/players/{playerId} - Returns a specific player (steam or oculus ID)

[ErisApps]

BeatLeader endpoints:
Needs some more digging into the repo. (https://github.com/BeatLeader/beatleader-server/tree/master/Controllers)

[ErisApps]

Hitbloq endpoints:
Needs some more digging into the repo. (https://github.com/DaFluffyPotato/hitbloq/blob/main/main.py)

[raineaeternal]

Regarding AccSaber endpoints. Please add a User Agent, so we can know who or what requested the info.

[ErisApps]

The usual format that I use for our lovely bot is POINext/{Version}. I hope that's fine for you?
Eg: https://github.com/ErisApps/POI/blob/main/POI.Core/Services/ScoreSaberApiService.cs#L52-L58

[raineaeternal]

Yep, that is all good. Thanks! ^^

[ErisApps]

This issue will be closed in favor of tickets #445, #446, #447.