Add support for Keychron K2 (non-RGB)

[dbolger]

I'm interested in using this library, and potentially the Home Assistant integration you've made, but there isn't any support for the K2 device.

I've researched the HID and I've gathered this information:

vendor_id: 1452/0x05ac
product_id: 591/0x24f

device_list = hid.enumerate(vendor_id, product_id)
for device in device_list:
    print(device)

Output:

{'path': b'/dev/hidraw8', 'vendor_id': 1452, 'product_id': 591, 'serial_number': '', 'release_number': 273, 'manufacturer_string': 'Keychron', 'product_string': 'Keychron K2', 'usage_page': 1, 'usage': 6, 'interface_number': 0}
{'path': b'/dev/hidraw9', 'vendor_id': 1452, 'product_id': 591, 'serial_number': '', 'release_number': 273, 'manufacturer_string': 'Keychron', 'product_string': 'Keychron K2', 'usage_page': 12, 'usage': 1, 'interface_number': 1}
{'path': b'/dev/hidraw9', 'vendor_id': 1452, 'product_id': 591, 'serial_number': '', 'release_number': 273, 'manufacturer_string': 'Keychron', 'product_string': 'Keychron K2', 'usage_page': 1, 'usage': 128, 'interface_number': 1}
{'path': b'/dev/hidraw9', 'vendor_id': 1452, 'product_id': 591, 'serial_number': '', 'release_number': 273, 'manufacturer_string': 'Keychron', 'product_string': 'Keychron K2', 'usage_page': 1, 'usage': 6, 'interface_number': 1}

The isConnected example works, but other functions do not work.

[dbolger]

From HID Explorer:

productName: Keychron Keychron K2
vendorId:    0x05AC (1452) Apple
productId:   0x024F (591)
opened:      false
collections[0]
  Usage: 000C:0001 (Consumer > Consumer Control)
  Input reports: 0x03
collections[1]
  Usage: 0001:0080 (Generic Desktop > System Control)
collections[2]
  Usage: 0001:0006 (Generic Desktop > Keyboard)
Input report 0x03
  16 bits (bits 0 to 15)
    Data,Ary,Abs
    Usages: 000C:0000 (Consumer usage 0x0000) to 000C:033C (Consumer usage 0x033C)
    Logical bounds: 0 to 828

productName: Keychron Keychron K2
vendorId:    0x05AC (1452) Apple
productId:   0x024F (591)
opened:      false
collections[0]
  Usage: 0001:0006 (Generic Desktop > Keyboard)
  Feature reports: 0x00
Feature report 0x00
  64 values * 8 bits (bits 0 to 511)
    Data,Var,Abs
    Usage: 000C:0000 (Consumer usage 0x0000)
    Logical bounds: -128 to 127

[dbolger]

@mishamyrt do you have any advice on how I can add support for my device?