Add support for EL30V2 device in manifest and device builder

custom_components/bluetti_bt/bluetti_bt_lib/devices/el30v2.py

@@ -0,0 +1,8 @@
+"""Elite 30 V2 fields."""
+
+from ..base_devices.ProtocolV2Device import ProtocolV2Device
+
+
+class EL30V2(ProtocolV2Device):
+    def __init__(self, address: str, sn: str):
+        super().__init__(address, "EL30V2", sn)