Add support for DEEBOT N20 Pro

[computercolinx]

The API does not recognize the Deebot N20 Pro, with device class aavvfb.py
From Home Assistant:

Logger: deebot_client.api_client
Source: components/ecovacs/controller.py:88
First occurred: 12:17:05 PM (1 occurrence)
Last logged: 12:17:05 PM

  Device class "aavvfb" not recognized. Please add support for it: {'did': '[REMOVED]', 'name': 'E07Q35568F09HXBY0109', 'class': 'aavvfb', 'resource': 'emgQ', 'company': 'eco-ng', 'bindTs': 1788301589272, 'service': {'jmq': 'jmq-ngiot-na.dc.ww.ecouser.net', 'mqs': 'api-ngiot.dc-na.ww.ecouser.net'}, 'deviceName': 'DEEBOT N20 PRO', 'icon': 'https://api-app.dc-na.ww.ecouser.net/api/pim/file/get/6643128b028bb2c1e5ab10f5', 'ota': True, 'UILogicId': 'y2dock_ww_h_y2h5', 'materialNo': '110-2406-0301', 'pid': '65f95336b895cd0760963627', 'product_category': 'DEEBOT', 'model': 'Y2_BLACK_INT', 'updateInfo': {'needUpdate': False, 'changeLog': ''}, 'nick': 'Dee-san', 'homeId': '6a9736f2a74a21a36be7098f', 'homeSort': 1, 'status': 1, 'otaUpgrade': {}, 'networkMode': 0}

Follows the same pattern as recent similar PRs (e.g. #1755, #1763).