Feat(LuaEngine): Move config reader to ElunaConfig

[iThorgrim]

[!WARNING] This PR is the beginning of the porting process for features added to Eluna. Since Multistate is the main objective of my contributions, I am adding each feature that revolves around it to simplify future integration and development.

[!NOTE] Implementation based on this commit Eluna 9806ef7.

📝 Description

This pull request introduces a new configuration system for the Eluna Lua Engine, encapsulating various settings and options into a dedicated ElunaConfig class. The configuration is now managed centrally and can be accessed more easily across the Eluna module.

Key Changes:

• Introduced the ElunaConfig class to manage various configuration values.
• Replaced direct use of eConfigMgr with ElunaConfig for better configuration handling.
• Refactored LuaEngine initialization and reloading to utilize the new configuration system.

[55Honey]

What's the replacement for the IsInitialized() check, which was called by IsEnabled()? Why is it no longer required in all the hooks of the object files?