Adding Local frame ENU velocity and COG to PVT monitor serialization

docs/protobuf/monitor_pvt.proto

@@ -43,4 +43,10 @@ double vdop = 28;  // Vertical Dilution of Precision
 
 double user_clk_drift_ppm = 29;  // User clock drift [ppm]
 string utc_time = 30; // PVT UTC time (rfc 3339 datetime string)
+
+double vel_e = 31;  // Velocity East component in Local frame, in m/s
+double vel_n = 32;  // Velocity Nord component in Local frame, in m/s
+double vel_u = 33;  // Velocity Up component in Local frame, in m/s
+
+double cog = 34; // Course Over Ground (cog) [deg]
 }