Feat: Mob Override Level Mapping

[GlobalHive]

📌 Description

Added mob level override mapping support and a default mapping configuration so specific NPC types can have fixed levels.

Motivation/Context: Enables explicit level overrides per NPC type when dynamic scaling isn’t desired.
Dependencies: None.

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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

Overrides are resolved via a new mapping class and default CSV configuration. MobLevelingUtil now checks the override mapping before applying dynamic logic.

🛠 Changes

• Added: MobOverrideMapping and defaultmoboverridemapping.csv
• Modified: MobLevelingUtil to apply override levels
• Modified: LevelingCore to wire the override mapping

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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

[GlobalHive]

Woop left my level randomization in there which i use on my server.
If you want i can remove it, or make it dynamic via new config option

[AzureDoom]

Oh I like! I say a new config option is good with me! Just a heads up that this won't be merged until next Saturday here as I will be out of town.

[GlobalHive]

How it works:
You give assign a baselevel in the mapping, whatever you choose
Env_Zone1_Plains,5

If the LevelVariance is 0, nothing happens, everything stays the same
The LevelVariance gets randomized based on NPC UUID and gets added on top of the base level

Example:

Baselevel = 5
Variance = 5

Finallevel = 5,6,7,8,9 or 10

Default setting is 0, so it doesn't mess with the setups of the users

LevelVariance applies to all LevelModes except SPAWN_ONLY