Add 'M114 E' to get E position (M114_DETAIL) (#16026)

Marlin/src/gcode/host/M114.cpp

       report_current_position_detail();
       return;
     }
+    if (parser.seen('E')) {
+      SERIAL_ECHOLNPAIR("Count E:", stepper.position(E_AXIS));
+      return;
+    }
   #endif
 
   planner.synchronize();