Add Mercator/Tuya Ikuu 5/6-ch switches support

[danielp370]

Proposed change

This PR adds support for the Tuya-based Mercator Ikuu 5-gang and 6-gang switches. Without this patch the light switches to not show up.
Example switch : https://mercator.com.au/products/ikuu-smart-zigbee-smart-5-gang-light-switch

Additional information

Tested and verified to work.

6 (Sextuple) gang switch:

Prior to patch:

  "node_descriptor": "NodeDescriptor(logical_type=<LogicalType.Router: 1>, complex_descriptor_available=0, user_descriptor_available=0, reserved=0, aps_flags=0, frequency_band=<FrequencyBand.Freq2400MHz: 8>, mac_capability_flags=<MACCapabilityFlags.FullFunctionDevice|MainsPowered|RxOnWhenIdle|AllocateAddress: 142>, manufacturer_code=4098, maximum_buffer_size=82, maximum_incoming_transfer_size=82, server_mask=11264, maximum_outgoing_transfer_size=82, descriptor_capability_field=<DescriptorCapability.NONE: 0>, *allocate_address=True, *is_alternate_pan_coordinator=False, *is_coordinator=False, *is_end_device=False, *is_full_function_device=True, *is_mains_powered=True, *is_receiver_on_when_idle=True, *is_router=True, *is_security_capable=False)",
  "endpoints": {
    "1": {
      "profile_id": "0x0104",
      "device_type": "0x0051",
      "input_clusters": [
        "0x0000",
        "0x0004",
        "0x0005",
        "0xef00"
      ],
      "output_clusters": [
        "0x000a",
        "0x0019"
      ]
    }
  },
  "manufacturer": "_TZE200_wnp4d4va",
  "model": "TS0601",
  "class": "zigpy.device.Device"
}

5 (Quintuple) gang switch

  "node_descriptor": "NodeDescriptor(logical_type=<LogicalType.Router: 1>, complex_descriptor_available=0, user_descriptor_available=0, reserved=0, aps_flags=0, frequency_band=<FrequencyBand.Freq2400MHz: 8>, mac_capability_flags=<MACCapabilityFlags.FullFunctionDevice|MainsPowered|RxOnWhenIdle|AllocateAddress: 142>, manufacturer_code=4098, maximum_buffer_size=82, maximum_incoming_transfer_size=82, server_mask=11264, maximum_outgoing_transfer_size=82, descriptor_capability_field=<DescriptorCapability.NONE: 0>, *allocate_address=True, *is_alternate_pan_coordinator=False, *is_coordinator=False, *is_end_device=False, *is_full_function_device=True, *is_mains_powered=True, *is_receiver_on_when_idle=True, *is_router=True, *is_security_capable=False)",
  "endpoints": {
    "1": {
      "profile_id": "0x0104",
      "device_type": "0x0051",
      "input_clusters": [
        "0x0000",
        "0x0004",
        "0x0005",
        "0xef00"
      ],
      "output_clusters": [
        "0x000a",
        "0x0019"
      ]
    }
  },
  "manufacturer": "_TZE200_leaqthqq",
  "model": "TS0601",
  "class": "zigpy.device.Device"
}

Checklist

• The changes are tested and work correctly
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify that the new code works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.17%. Comparing base (c6ed94a) to head (cdd91b3).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #3218   +/-   ##
=======================================
  Coverage   88.17%   88.17%           
=======================================
  Files         300      300           
  Lines        9386     9390    +4     
=======================================
+ Hits         8276     8280    +4     
  Misses       1110     1110           

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[TheJulianJES]

Thanks!