WIP: The tracing service prototype

services/resource_coordinator/tracing/manifest.json

+{
+  "name": "tracing",
+  "display_name": "Tracing Service",
+  "interface_provider_specs": {
+    "service_manager:connector": {
+      "provides": {
+        "app": [ "resource_coordinator::tracing::mojom::AgentSet" ],
+        "coordinator": [ "resource_coordinator::tracing::mojom::Coordinator" ]
+      },
+      "requires": {
+        "*": [ "app" ],
+        "service_manager": [ "service_manager:all_users" ]
+      }
+    }
+  }
+}