lnrpc: add feature bits to PayReq

lnrpc/rpc.proto

@@ -2628,6 +2628,14 @@ message PayReq {
     repeated RouteHint route_hints = 10 [json_name = "route_hints"];
     bytes payment_addr = 11 [json_name = "payment_addr"];
     int64 num_msat = 12 [json_name = "num_msat"];
+    repeated Feature features = 13 [json_name = "features"];
+}
+
+message Feature {
+        uint32 bit = 1 [json_name = "bit"];
+        string name = 2 [json_name = "name"];
+        bool is_required = 3 [json_name = "is_required"];
+        bool is_known = 4 [json_name = "is_known"];
 }
 
 message FeeReportRequest {}

lnrpc/rpc.swagger.json

@@ -2243,6 +2243,26 @@
         }
       }
     },
+    "lnrpcFeature": {
+      "type": "object",
+      "properties": {
+        "bit": {
+          "type": "integer",
+          "format": "int64"
+        },
+        "name": {
+          "type": "string"
+        },
+        "is_required": {
+          "type": "boolean",
+          "format": "boolean"
+        },
+        "is_known": {
+          "type": "boolean",
+          "format": "boolean"
+        }
+      }
+    },
     "lnrpcFeeLimit": {
       "type": "object",
       "properties": {
@@ -3271,6 +3291,12 @@
         "num_msat": {
           "type": "string",
           "format": "int64"
+        },
+        "features": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/lnrpcFeature"
+          }
         }
       }
     },