feat(Core/Hooks): Add OnAfterDatabaseLoadCreatureTemplates hook (#17621)

* Add OnAfterDatabaseLoadCreatureTemplates hook
- fix issue where the fast template cache was not updated correctly after a CS reload of a single creature template

* Parameter naming tweak to reduce confusion.

* Refactor to streamline fastcache creation, remove threading concerns

* Remove unneeded resize when loading creature templates

* Update fast cache resizing to highest-performing option

src/server/game/Scripting/ScriptDefines/DatabaseScript.cpp

@@ -25,3 +25,11 @@ void ScriptMgr::OnAfterDatabasesLoaded(uint32 updateFlags)
         script->OnAfterDatabasesLoaded(updateFlags);
     });
 }
+
+void ScriptMgr::OnAfterDatabaseLoadCreatureTemplates(std::vector<CreatureTemplate*> creatureTemplates)
+{
+    ExecuteScript<DatabaseScript>([&](DatabaseScript* script)
+    {
+        script->OnAfterDatabaseLoadCreatureTemplates(creatureTemplates);
+    });
+}