Add experimental GraphQL user parser

src/experimental/parser/graphql.nim

@@ -0,0 +1,8 @@
+import jsony
+import ../types/graphql, user
+from ../../types import User
+
+proc parseGraphUser*(json: string): User =
+  let raw = json.fromJson(GraphUser)
+  result = toUser raw.data.user.result.legacy
+  result.id = raw.data.user.result.restId