rework folder structure complitly

server/game_state_store/__init__.py

@@ -0,0 +1,10 @@
+from .MemoryGameBoardStore import MemoryGameBoardStore
+from .RedisGameBoardStore import RedisGameBoardStore
+
+class GameStateStoreBuilder:
+  @classmethod
+  def build(self, backend:str="memory", **kwargs) -> MemoryGameBoardStore|RedisGameBoardStore:
+    selected = (backend or "memory").strip().lower()
+    if selected == "redis":
+      return RedisGameBoardStore(**kwargs)
+    return MemoryGameBoardStore(**kwargs)