Feature: Dump hex data from meter to MQTT (#1071)

* Send raw data debug to MQTT

* Publish hexdump to /data

* Sensor for /data, but it doesnt work

lib/HomeAssistantMqttHandler/json/hadiscover.json

@@ -3,7 +3,6 @@
     "stat_t" : "%s%s",
     "uniq_id" : "%s_%s",
     "obj_id" : "%s_%s",
-    "unit_of_meas" : "%s",
     "val_tpl" : "{{ value_json.%s | is_defined }}",
     "expire_after" : %d,
     "dev" : {
@@ -13,5 +12,8 @@
       "sw" : "%s",
       "mf" : "%s",
       "cu" : "%s"
-    }%s%s%s%s%s%s
+    }
+    %s%s%s
+    %s%s%s
+    %s%s%s
 }