Support for H5121 motion sensor

[Weezulla]

• Which model is this? Need the Hxxxx number.
  H5121

• Which type of device is this? Light, heater, leak sensor, etc.
  Motion sensor

• Which connection methods does this device have? Wifi? Bluetooth? LAN mode? All?
  appears to be BLE only

• Anything else?
  {"device":"C9:5A:D2:32:39:37:39:14","deviceName":"Laundry Motion Sensor","model":"H5121","httpInfo":{"groupId":0,"device":"C9:5A:D2:32:39:37:39:14","sku":"H5121","spec":"","versionHard":"1","versionSoft":"4","deviceName":"Laundry Motion Sensor","deviceExt":{"deviceSettings":"{"address":"D2:32:39:37:39:14","bleName":"GV51213914","ic":0,"sku":"H5121","device":"C9:5A:D2:32:39:37:39:14","deviceName":"Laundry Motion Sensor","versionHard":"1","versionSoft":"4","battery":100,"time":1712832840246}","lastDeviceData":"{"online":true,"bind":true}","extResources":"{"skuUrl":"","headOnImg":"","headOnImgNew":"","headOffImg":"","headOffImgNew":"","ext":"","ic":0}"},"share":0,"deviceId":16687880,"gidConfirmed":false,"goodsType":130,"attributesId":0,"supportScene":0}

[jsk01]

I second adding support for this sensor.