rework folder structure complitly

tests/test_Dataset.py

@@ -1,7 +1,7 @@
 import unittest
 from typing import cast
 
-from server.Dataset import Dataset
+from server.dataset.Dataset import Dataset
 from server.GameBoard import GameBoard
 
 class DummySnake:

tests/test_DatasetExporter.py

@@ -3,7 +3,7 @@ import tempfile
 import unittest
 from pathlib import Path
 
-from server.DatasetExporter import DatasetExporter
+from server.dataset.DatasetExporter import DatasetExporter
 
 class TestDatasetExporter(unittest.TestCase):
   def test_export_jsonl(self):

tests/test_GameStateStore.py

@@ -2,9 +2,7 @@ import unittest
 from typing import Any, cast
 
 from server.GameBoard import GameBoard
-from server.game_board_stats import GameBoardStoreBuilder
-from server.game_board_stats.MemoryGameBoardStore import MemoryGameBoardStore
-from server.game_board_stats.RedisGameBoardStore import RedisGameBoardStore
+from server.game_state_store import GameStateStoreBuilder, MemoryGameBoardStore, RedisGameBoardStore
 from snakes.TemplateSnake import TemplateSnake
 
 class _FakeRedis:
@@ -73,9 +71,9 @@ class TestGameStateStore(unittest.IsolatedAsyncioTestCase):
     return board
 
   def test_builder_selects_store_backend(self):
-    memory_store = GameBoardStoreBuilder.build(backend="memory")
-    redis_store = GameBoardStoreBuilder.build(backend="redis")
-    default_store = GameBoardStoreBuilder.build(backend="unknown")
+    memory_store = GameStateStoreBuilder.build(backend="memory")
+    redis_store = GameStateStoreBuilder.build(backend="redis")
+    default_store = GameStateStoreBuilder.build(backend="unknown")
 
     self.assertIsInstance(memory_store, MemoryGameBoardStore)
     self.assertIsInstance(redis_store, RedisGameBoardStore)