feat: Add core map generation and management system

- Introduced MapData, MapGenerator, and MapPainter classes for procedural map generation.
- Implemented LevelManager to handle level initialization and navigation.
- Created TurnManager for managing turn order in a turn-based system.
- Added Player and Enemy character classes with movement and turn-taking capabilities.
- Established pathfinding using AStar2D in PathfindingHandler.
- Integrated new scenes for player and enemy characters, along with world setup.
- Included a new tileset for futuristic Zelda-themed assets.

scenes/world.tscn

@@ -0,0 +1,10 @@
+[gd_scene format=3 uid="uid://cnb0ykbiglgo6"]
+
+[ext_resource type="Script" uid="uid://6xvdnyxsb2uq" path="res://scripts/world.gd" id="1_71j4m"]
+[ext_resource type="TileSet" uid="uid://cmycomep4ap8y" path="res://assets/tilesets/office_02.tres" id="4_qfnet"]
+
+[node name="World" type="Node2D" unique_id=1504396068]
+script = ExtResource("1_71j4m")
+
+[node name="MapLayer" type="TileMapLayer" parent="." unique_id=2055425416]
+tile_set = ExtResource("4_qfnet")