Add heltec v3 (#237)

mesh.proto

@@ -354,6 +354,11 @@ enum HardwareModel {
    * M5 esp32 based MCU modules with enclosure, TFT and LORA Shields. All Variants (Basic, Core, Fire, Core2, Paper) https://m5stack.com/
    */
   M5STACK = 42;
+
+  /*
+   * New Heltec LoRA32 with ESP32-S3 CPU
+   */
+  HELTEC_V3 = 43;
   
   /*
    * Reserved ID For developing private Ports. These will show up in live traffic sparsely, so we can use a high number. Keep it within 8 bits.