Brawlstats

Fixed
- Fix any data that involves a list (Leaderboard)

Added
- `get_datetime` function for easier date and time conversions

Changed
- No longer need to access a players or clubs attribute when getting a leaderboard

Fixed
- Fixed a bug in the sync version of `get_constants()` where there was an extra `await`

Added
- Constants extracted from the Brawl Stars App using `Client.get_constants`

BREAKING CHANGES: Brawl Stars dev team changed "Band" to "Club". This update fixes all of that.
Changed
- `Band` has been changed to `Club`
- `SimpleBand` has been changed to `PartialClub`
- Documentation has been updated for this
- All methods that originally had "band" in them have been changed to "club"
- All attributes that originally had "band" in them have been changed to "club"