move snake builder into __init__ of snakes file and use it into server class

snakes/__init__.py

@@ -0,0 +1,33 @@
+import importlib
+
+SNAKE_REGISTRY = {
+  "TemplateSnake": "1.0.0",
+  "DummSnake": "1.0.0",
+  "LogicSnake": "1.1.0",
+  "MasterSnake": "1.2.0",
+  "BetterMasterSnake": "1.3.0",
+  "BestBattleSnake": "2.5.0",
+}
+
+def build_snake(selected_snake: str):
+  if selected_snake not in SNAKE_REGISTRY:
+    raise ValueError(f"Unknown snake: {selected_snake}")
+
+  snake_module = importlib.import_module(f"snakes.{selected_snake}")
+  snake_class = getattr(snake_module, selected_snake)
+  return snake_class()
+
+def get_snake_version(selected_snake: str) -> str | None:
+  version = SNAKE_REGISTRY.get(selected_snake)
+  if version is None:
+    return None
+  return str(version)
+
+class SnakeBuilder:
+  @classmethod
+  def build(self, selected_snake: str):
+    return build_snake(selected_snake)
+
+  @classmethod
+  def get_version(self, selected_snake: str) -> str | None:
+    return get_snake_version(selected_snake)