bluetooth: implement pairing agent

[bbedward]

Implements a bluetooth pairing agent that is required to pair a variety of devices.

Currently, you're unable to pair any device that requires a pin, confirmation dialog, passkey, etc. Hopefully this can bring quickshell closer to being a replacement for blueman, bluetoothctl commands, etc.

It sends a signal when a device needs confirmation, pin, etc. IE:

Connections {
    target: Bluetooth.agent

    function onPairingRequested(deviceAddress, type, passkey, token) {
        switch (type) {
        case BluetoothPairingRequestType.Authorization:
            // Show "Allow pairing?" dialog
            Bluetooth.agent.respondToRequest(token, true) // Accept
            break

        case BluetoothPairingRequestType.Confirmation:
            // Show "Confirm passkey: ${passkey}?" dialog
            Bluetooth.agent.respondToRequest(token, true) // Accept
            break

        case BluetoothPairingRequestType.PinCode:
            // Show PIN entry dialog
            Bluetooth.agent.respondWithPinCode(token, "1234")
            break

        case BluetoothPairingRequestType.Passkey:
            // Show numeric entry dialog
            Bluetooth.agent.respondWithPasskey(token, 123456)
            break
        }
    }
}

[outfoxxed]

This is not how I want to handle this implementation or interface wise, and I already have an implementation in a local worktree. My apologies but I'm going to close this.

Please make an issue or ping me in one of the chat rooms before writing anything substantial next time