Make a getPeerTransportParams function

Summary: I'm putting this up to get some initial feedback. I'm writing a function to get the peer transport parameters so that we can get them in the HQSession and set the QUIC fingerprint.

Reviewed By: hanidamlaj

Differential Revision: D54399572

fbshipit-source-id: 594294c26a5b34bc99a8d286a66be9cdbe7fff02

quic/api/test/QuicTransportBaseTest.cpp

@@ -261,6 +261,11 @@ class TestQuicTransport
     closeUdpSocket();
   }
 
+  folly::Optional<std::vector<TransportParameter>> getPeerTransportParams()
+      const override {
+    return folly::none;
+  }
+
   std::chrono::milliseconds getLossTimeoutRemainingTime() {
     return lossTimeout_.getTimerCallbackTimeRemaining();
   }