Reapply "Merge branch 'main' of https://github.com/GooGuTeam/osu_lazer_api"

This reverts commit 68701dbb1d.

app/router/signalr/hub/spectator.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+from app.models.spectator_hub import FrameDataBundle, SpectatorState
+
+from .hub import Client, Hub
+
+
+class SpectatorHub(Hub):
+    async def BeginPlaySession(
+        self, client: Client, score_token: int, state: SpectatorState
+    ) -> None:
+        ...
+
+    async def SendFrameData(
+        self, client: Client, frame_data: FrameDataBundle
+    ) -> None:
+        ...