feat: allow running review app to validate PR from external contribution

* create a review app to access to different basic streamsync application

Procfile

@@ -1 +1 @@
-web: streamsync --port $PORT --host 0.0.0.0 --enable-remote-edit edit apps/hello
+web: python apps/reviewapp.py

apps/reviewapp.py

@@ -0,0 +1,43 @@
+import os
+
+import uvicorn
+from fastapi.responses import HTMLResponse
+from fastapi import FastAPI, Response
+
+import streamsync.serve
+
+
+def app_path(app_name: str) -> str:
+    return os.path.join(os.path.dirname(__file__), app_name)
+
+root_asgi_app = FastAPI(lifespan=streamsync.serve.lifespan)
+sub_asgi_app_1 = streamsync.serve.get_asgi_app(app_path("hello"), "edit", enable_remote_edit=True)
+sub_asgi_app_2 = streamsync.serve.get_asgi_app(app_path("default"), "edit", enable_remote_edit=True)
+sub_asgi_app_3 = streamsync.serve.get_asgi_app(app_path("quickstart"), "edit", enable_remote_edit=True)
+
+root_asgi_app.mount("/hello/", sub_asgi_app_1)
+root_asgi_app.mount("/default/", sub_asgi_app_2)
+root_asgi_app.mount("/quickstart/", sub_asgi_app_3)
+
+
+
+@root_asgi_app.get("/")
+async def init():
+    links = [
+        f'<li><a href="/hello">hello</a></li>',
+        f'<li><a href="/default"">default</a></li>',
+        f'<li><a href="/quickstart">quickstart</a></li>',
+    ]
+
+    return HTMLResponse("""
+        <h1>Streamsync review app</h1>
+        <ul>
+        """ + "\n".join(links) + """
+        </ul>
+        """, status_code=200)
+
+uvicorn.run(root_asgi_app,
+    host="0.0.0.0",
+    port=os.getenv('PORT', 8000),
+    log_level="warning",
+    ws_max_size=streamsync.serve.MAX_WEBSOCKET_MESSAGE_SIZE)

pyproject.toml

@@ -34,6 +34,7 @@ watchdog = ">= 3.0.0, < 4"
 pandas = {version = ">= 2.2.0, < 3", optional = true}
 pyarrow = {version = ">= 15.0.0, < 16.0.0",optional = true}
 plotly = {version = ">= 5.18.0, < 6", optional = true}
+scikit-learn = {version = "^1.4.1.post1", optional = true}
 
 
 [tool.poetry.group.build]

src/streamsync/serve.py

@@ -368,6 +368,7 @@ async def stream(websocket: WebSocket):
 
     server_path = os.path.dirname(__file__)
     server_static_path = pathlib.Path(server_path) / "static"
+
     if server_static_path.exists():
         asgi_app.mount(
             "/", StaticFiles(directory=str(server_static_path), html=True), name="server_static")