refactor: Cache the Config Value

[Tereneckla]

Changes Proposed:

Cache the config value. Example code should show the best practices

[Copilot]

Pull Request Overview

This PR refactors configuration value access to use a caching mechanism instead of direct sConfigMgr calls, improving performance by avoiding repeated config lookups. The change demonstrates best practices for config value caching in the AzerothCore framework.

Key changes:

• Introduces a config caching system using ConfigValueCache with enum-based config identifiers
• Replaces direct sConfigMgr->GetOption calls with cached config value access
• Adds proper initialization through a WorldScript hook

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