Copybara chat settings copy [continued]

Changelog for Copybara v1.2:

1. Updated for WoW Interface version 110002 (The War Within expansion).
2. Replaced deprecated GetAddOnMetadata with C_AddOns.GetAddOnMetadata.
3. Added SafeGetAddOnMetadata function for backwards compatibility.
4. Updated OnInitialize function to use C_AddOns.IsAddOnLoaded.
5. Added OnAddonLoaded and SetupCombatLog functions for better addon loading management.
6. Implemented new "Sync All Characters" feature:
   • Added a button in the addon settings to sync chat settings.
   • Shows a confirmation popup with a list of characters that will receive the settings.
   • Syncs current character's chat settings to all other characters when confirmed.
7. Minor code optimizations and cleanup.