Add logging and addr rate limiting statistics

Includes logging improvements by Vasil Dimov and John Newbery.

src/net_processing.h

@@ -29,6 +29,8 @@ struct CNodeStateStats {
     int m_starting_height = -1;
     std::chrono::microseconds m_ping_wait;
     std::vector<int> vHeightInFlight;
+    uint64_t m_addr_processed = 0;
+    uint64_t m_addr_rate_limited = 0;
 };
 
 class PeerManager : public CValidationInterface, public NetEventsInterface