expose remoteMaxMessageSize on peerconnection

include/rtc/peerconnection.hpp

@@ -84,6 +84,7 @@ public:
 	bool hasMedia() const;
 	optional<Description> localDescription() const;
 	optional<Description> remoteDescription() const;
+	size_t remoteMaxMessageSize() const;
 	optional<string> localAddress() const;
 	optional<string> remoteAddress() const;
 	uint16_t maxDataChannelId() const;

src/peerconnection.cpp

@@ -69,6 +69,8 @@ optional<Description> PeerConnection::remoteDescription() const {
 	return impl()->remoteDescription();
 }
 
+size_t PeerConnection::remoteMaxMessageSize() const { return impl()->remoteMaxMessageSize(); }
+
 bool PeerConnection::hasMedia() const {
 	auto local = localDescription();
 	return local && local->hasAudioOrVideo();