Support leaderboard "scopes"

[Vrixyz]

Context

Sometimes in games, scoring systems can involve muiltiple leaderboards, where scores are:

• Grouped by resource
  • speed to finish a level
  • wealth at the end
  • ...
• Grouped by context
  • levels
  • a different leaderboard for each day
  • ranked play or "casual"
  • ...

Exact need

I would like to easily embed multiple leaderboards in my game.

Current workaround

We can create a lot of leaderboards and use different uuid+secret for each of our resource/context, but it becomes quickly a lot of code and error-prone.

Proposed solutions

Sub-Leaderboards

Add a tag to each score, which we could filter and rebuild any sub-leaderboard necessary, that could enable scores to exist in multiple sub-leaderboards

Pros

• most modular for developers

Cons

• scores can easily be hard to read if the filter is too complicated
• easy to misuse with the wrong tag or filter ?

Collection of leaderboards

Current Leaderboard becomes a collection of leaderboard:

• each one having their own string name, with an optional default one such as "main"
• They are created lazily when a player needs one specific type.

Pro

• developer-facing API can easily be adapted to support an optional "LeaderboardName" target

Cons

• easily DDOSable ? (might be circumvented with wildcards of possible leaderboard names..?)
• backend and administration UI to be reworked more heavily than sub-leaderboards

[mockersf]

this can be simulated currently using the meta field when submitting a score: https://docs.rs/bevy_jornet/latest/bevy_jornet/struct.Leaderboard.html#method.send_score_with_meta

[Vrixyz]

Seems good enough to me, next step is probably filtering via more complex queries but that should probably be another discussion