litrpc+server: show cfg in ListAutopilotFeatures

We pass on default configuration to litrpc in order to display them in
the list features call.

Author: bitromortac

litrpc/lit-autopilot.pb.go

@@ -161,6 +161,11 @@ message Feature {
     feature rules set contains a rule that Litd is unaware of.
     */
     bool requires_upgrade = 5;
+
+    /*
+    The JSON-marshaled representation of a feature's default configuration.
+    */
+    string default_config = 6;
 }
 
 message RuleValues {
@@ -196,4 +201,4 @@ message Permissions {
     A list of the permissions required for this method.
     */
     repeated MacaroonPermission operations = 2;
-}
+}

litrpc/lit-autopilot.proto

@@ -265,6 +265,10 @@
         "requires_upgrade": {
           "type": "boolean",
           "description": "A boolean indicating if the user would need to upgrade their Litd version in\norder to subscribe to the Autopilot feature. This will be true if the\nfeature rules set contains a rule that Litd is unaware of."
+        },
+        "default_config": {
+          "type": "string",
+          "description": "The JSON-marshaled representation of a feature's default configuration."
         }
       }
     },

litrpc/lit-autopilot.swagger.json

@@ -815,6 +815,7 @@ func (s *sessionRpcServer) ListAutopilotFeatures(ctx context.Context,
 			Rules:           rules,
 			PermissionsList: marshalPerms(f.Permissions),
 			RequiresUpgrade: upgrade,
+			DefaultConfig:   string(f.DefaultConfig),
 		}
 	}