feat(demo): add isolated demo environments

apps/demos/api/views.py

@@ -0,0 +1,29 @@
+from drf_spectacular.utils import extend_schema, inline_serializer
+from rest_framework import serializers, status
+from rest_framework.permissions import AllowAny
+from rest_framework.response import Response
+from rest_framework.views import APIView
+
+from apps.demos.api.throttles import DemoStartThrottle
+from apps.demos.services import create_demo_environment
+
+
+class DemoStartView(APIView):
+    permission_classes = (AllowAny,)
+    throttle_classes = (DemoStartThrottle,)
+
+    @extend_schema(
+        request=None,
+        responses=inline_serializer(
+            name="DemoStartResponse",
+            fields={
+                "access": serializers.CharField(),
+                "refresh": serializers.CharField(),
+                "workspace_id": serializers.CharField(),
+                "expires_at": serializers.DateTimeField(),
+                "demo_environment_id": serializers.CharField(),
+            },
+        ),
+    )
+    def post(self, request):
+        return Response(create_demo_environment(), status=status.HTTP_201_CREATED)