lnrpc: extract or add REST annotations to yaml

lnrpc/verrpc/verrpc.swagger.json

@@ -4,18 +4,71 @@
     "title": "verrpc/verrpc.proto",
     "version": "version not set"
   },
-  "schemes": [
-    "http",
-    "https"
-  ],
   "consumes": [
     "application/json"
   ],
   "produces": [
     "application/json"
   ],
-  "paths": {},
+  "paths": {
+    "/v2/versioner/version": {
+      "get": {
+        "summary": "lncli: `version`\nGetVersion returns the current version and build information of the running\ndaemon.",
+        "operationId": "GetVersion",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/verrpcVersion"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response",
+            "schema": {
+              "$ref": "#/definitions/runtimeError"
+            }
+          }
+        },
+        "tags": [
+          "Versioner"
+        ]
+      }
+    }
+  },
   "definitions": {
+    "protobufAny": {
+      "type": "object",
+      "properties": {
+        "type_url": {
+          "type": "string"
+        },
+        "value": {
+          "type": "string",
+          "format": "byte"
+        }
+      }
+    },
+    "runtimeError": {
+      "type": "object",
+      "properties": {
+        "error": {
+          "type": "string"
+        },
+        "code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "message": {
+          "type": "string"
+        },
+        "details": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/protobufAny"
+          }
+        }
+      }
+    },
     "verrpcVersion": {
       "type": "object",
       "properties": {