tests: implemented tile_offset test

tests/test_data/tilesets/image_tile_offset/expected.py

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+from pathlib import Path
+
+from pytiled_parser import tileset
+from pytiled_parser.common_types import Color, OrderedPair
+
+EXPECTED = tileset.TileSet(
+    columns=8,
+    image=Path("../../maps/images/tmw_desert_spacing.png"),
+    image_height=199,
+    image_width=265,
+    margin=1,
+    spacing=1,
+    name="tile_set_image",
+    tile_count=48,
+    tiled_version="1.3.5",
+    tile_height=32,
+    tile_width=32,
+    version=1.2,
+    tile_offset=OrderedPair(3, 5),
+)

tests/test_data/tilesets/image_tile_offset/tileset.json

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+{ "columns":8,
+ "editorsettings":
+    {
+     "export":
+        {
+         "format":"",
+         "target":"..\/image"
+        }
+    },
+ "image":"..\/..\/maps\/images\/tmw_desert_spacing.png",
+ "imageheight":199,
+ "imagewidth":265,
+ "margin":1,
+ "name":"tile_set_image",
+ "spacing":1,
+ "tilecount":48,
+ "tiledversion":"1.3.5",
+ "tileheight":32,
+ "tileoffset":
+    {
+     "x":3,
+     "y":5
+    },
+ "tilewidth":32,
+ "type":"tileset",
+ "version":1.2
+}