Updated Ragger app client for trusted name & sign APDUs

Also added two new optional arguments to pytest :
--gold for screenshot generation
--chainid to specify an alternative app chain ID

tests/ragger/app/response_parser.py

@@ -12,3 +12,7 @@ class   EthereumRespParser:
         data = data[32:]
 
         return v, r, s
+
+    def challenge(self, data: bytes) -> int:
+        assert len(data) == 4
+        return int.from_bytes(data, "big")