Add Performance Warnings

[ez-plugins]

New Feature:

performance:
  monitoring:
    enabled: true
    warn-slow-rtp: true
    threshold-ms: 100
    log-to-console: true
    log-to-file: true

Console Output Example:

[EzRTP] [WARN] RTP took 450ms for player Blake (threshold: 100ms)
[EzRTP] [WARN] Cause: Biome rejection attempts: 23, Chunk loads: 12
[EzRTP] [INFO] Consider disabling biome filtering or increasing cache size

Estimated Impact: Helps admins identify and fix performance issues proactively.