feat: add props dimension

data/dev/dimension/props.json

@@ -0,0 +1,30 @@
+{
+    "type": "dev:props",
+    "generator": {
+        "type": "minecraft:flat",
+        "settings": {
+            "biome": "minecraft:plains",
+            "lakes": false,
+            "features": false,
+            "layers": [
+                {
+                    "height": 120,
+                    "block": "minecraft:air"
+                },
+                {
+                    "height": 1,
+                    "block": "minecraft:bedrock"
+                },
+                {
+                    "height": 3,
+                    "block": "minecraft:dirt"
+                },
+                {
+                    "height": 1,
+                    "block": "minecraft:grass_block"
+                }
+            ],
+            "structure_overrides": []
+        }
+    }
+}

data/dev/dimension_type/props.json

@@ -0,0 +1,14 @@
+{
+  "has_skylight": true,
+  "has_ceiling": false,
+  "has_ender_dragon_fight": false,
+  "coordinate_scale": 1,
+  "ambient_light": 0,
+  "has_fixed_time": true,
+  "logical_height": 0,
+  "infiniburn": "#minecraft:infiniburn_overworld",
+  "min_y": -64,
+  "height": 320,
+  "monster_spawn_light_level": 0,
+  "monster_spawn_block_light_limit": 0
+}