fix(team): improve lookups, event handling and distribution array bounds

[theEvilReaper]

Proposed changes

The pull request improves the definition of the included Team. Now a team is stored via a key from Adventure which makes it easier to access than a global id or the reference of them.

StandardTeamService now uses a ConcurrentHashMap for thread-safe O(1) lookups, fixing exceptions when fetching missing teams. Player mutations are now executed inside event callbacks to respect event cancellation, and team distribution fixes prevent premature loop aborts and array bounds errors when teams reach full capacity.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have added tests that prove my fix is effective or that my feature works
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