Refactor event channels and update layer specifications

- Removed StatusEffectEventChannelSO and its associated meta file.
- Updated CreateEventChannelAssets to handle new shield-related events.
- Added CharmModule for managing charm assets in the DataHub.
- Introduced CharmEventChannelSO for charm equipped/unequipped events.
- Changed layer references from "Ground" to "Platform" in various scripts.
- Updated documentation to reflect changes in layer specifications.
- Created new event assets for ShieldBroken, ShieldRestored, StatusEffectApplied, and StatusEffectExpired.

Assets/_Game/Data/Events/Combat/EVT_EnemyDied.asset

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Assets/_Game/Data/Events/Combat/EVT_ShieldBroken.asset

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