feat: add EquipBlockManager to handle item level restrictions

[GlobalHive]

📌 Description

Adds an equipment restriction manager that enforces item level requirements when players try to equip armor, and wires its lifecycle into plugin startup/shutdown behind the existing item-restriction config flag.

When a player equips armor above their level, the equip action is rolled back, the item is returned to inventory, and a localized level-required message is sent.

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🧪 Type of Change

Please check the types of changes your PR introduces:

• Bug fix (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
• Tests added / updated

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👩‍💻 Implementation Details

Introduced an event-driven equipment guard that listens to inventory/armor transactions and reverts invalid equips based on configured item level mapping vs player level.

🛠 Changes

What was added

• New EquipBlockManager system for armor equip validation and rollback.
• Registration/unregistration hooks in plugin lifecycle when item level restriction is enabled.

What was removed

• Nothing removed in this commit.

What was modified

• Core plugin initialization/shutdown updated to start/stop the equipment restriction manager.
• Inventory transaction handling now supports nested transaction rollback for invalid armor equips.
• Player feedback message sent on restriction failure with required level, current level, and item id.

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✅ Checklist

Go over all the following items and check them before submitting your PR:

• My code follows the project’s code style (simply run spotlessApply to apply formatting)
• I have performed a self-review of my own code
• I have commented my code where necessary
• My changes generate no new warnings

[AzureDoom]

Not seeing anything offhand so gonna merge and test here locally!