Add ability to set logging identifier

[twyatt]

Example of setting logging identifier to "Example":

OS X

...
2021-09-09 02:22:48.788 sensortag.kexe[42195:875213] V/Kable: Example Configuring characteristic observations
2021-09-09 02:22:48.788 sensortag.kexe[42195:875213] I/Kable: Example Connected
2021-09-09 02:22:48.789 sensortag.kexe[42195:875213] D/Kable: Example CentralManager.notify
  service: f000aa80-0451-4000-b000-000000000000
  characteristic: f000aa81-0451-4000-b000-000000000000
[I/Unknown] Connected
[V/Unknown] Writing gyro period
[I/Unknown] movement → writePeriod → data = 255 (FF)
2021-09-09 02:22:48.790 sensortag.kexe[42195:875213] D/Kable: Example write
  service: f000aa80-0451-4000-b000-000000000000
  characteristic: f000aa83-0451-4000-b000-000000000000
  writeType: WithoutResponse
  data: FF
...
2021-09-09 02:22:49.147 sensortag.kexe[42195:875235] D/Kable/Delegate: Example 7BA26113-69FC-4087-90FE-6E02F9C46B20 didUpdateValueForCharacteristic
  service: F000AA80-0451-4000-B000-000000000000
  characteristic: F000AA81-0451-4000-B000-000000000000
  data: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[I/Unknown] Vector3f(x=0.0, y=0.0, z=0.0)
2021-09-09 02:22:51.713 sensortag.kexe[42195:875236] D/Kable/Delegate: Example 7BA26113-69FC-4087-90FE-6E02F9C46B20 didUpdateValueForCharacteristic
  service: F000AA80-0451-4000-B000-000000000000
  characteristic: F000AA81-0451-4000-B000-000000000000
[I/Unknown] Vector3f(x=9.20105, y=249.99237, z=-29.083252)
  data: B6 04 FF 7F 1C F1 A0 07 84 FF A4 27 00 00 00 00 00 00

Android

2021-09-09 02:30:52.382 19943-19943/com.juul.sensortag V/Kable/Peripheral: Example discoverServices
2021-09-09 02:30:52.384 19943-20022/com.juul.sensortag D/BluetoothGatt: discoverServices() - device: 54:6C:0E:53:01:7D
2021-09-09 02:30:52.389 19943-19943/com.juul.sensortag I/System.out: [D/SensorViewModel$connect] connect
2021-09-09 02:30:52.827 19943-20002/com.juul.sensortag D/BluetoothGatt: onConnectionUpdated() - Device=54:6C:0E:53:01:7D interval=6 latency=0 timeout=500 status=0
2021-09-09 02:30:54.520 19943-20002/com.juul.sensortag D/BluetoothGatt: onSearchComplete() = Device=54:6C:0E:53:01:7D Status=0
2021-09-09 02:30:54.523 19943-20022/com.juul.sensortag D/Kable/Callback: Example onServicesDiscovered
    status: GATT_SUCCESS(0)
2021-09-09 02:30:54.535 19943-19943/com.juul.sensortag V/Kable/Peripheral: Example Configuring characteristic observations
2021-09-09 02:30:54.535 19943-19943/com.juul.sensortag I/Kable/Peripheral: Example Connected
2021-09-09 02:30:54.546 19943-20022/com.juul.sensortag D/BluetoothGatt: readRssi() - device: 54:6C:0E:53:01:7D
2021-09-09 02:30:54.549 19943-19943/com.juul.sensortag D/Kable/Peripheral: Example setCharacteristicNotification
    service: f000aa80-0451-4000-b000-000000000000
    characteristic: f000aa81-0451-4000-b000-000000000000
    value: true
2021-09-09 02:30:54.550 19943-19943/com.juul.sensortag D/BluetoothGatt: setCharacteristicNotification() - uuid: f000aa81-0451-4000-b000-000000000000 enable: true
2021-09-09 02:30:54.552 19943-19943/com.juul.sensortag V/Kable/Peripheral: Example Writing ENABLE_NOTIFICATION_VALUE to CCCD
    service: f000aa80-0451-4000-b000-000000000000
    characteristic: f000aa81-0451-4000-b000-000000000000
    descriptor: 00002902-0000-1000-8000-00805f9b34fb
2021-09-09 02:30:54.553 19943-19943/com.juul.sensortag D/Kable/Peripheral: Example write
    service: f000aa80-0451-4000-b000-000000000000
    characteristic: f000aa81-0451-4000-b000-000000000000
    descriptor: 00002902-0000-1000-8000-00805f9b34fb
    data: 01 00
2021-09-09 02:30:54.557 19943-20022/com.juul.sensortag D/Kable/Callback: Example onReadRemoteRssi
    rssi: -60
    status: GATT_SUCCESS(0)
2021-09-09 02:30:54.558 19943-19943/com.juul.sensortag I/System.out: [I/SensorTag] Enabling gyro
2021-09-09 02:30:54.558 19943-19943/com.juul.sensortag D/Kable/Peripheral: Example write
    service: f000aa80-0451-4000-b000-000000000000
    characteristic: f000aa82-0451-4000-b000-000000000000
    writeType: WithoutResponse
    data: 7F 00
2021-09-09 02:30:54.560 19943-19943/com.juul.sensortag I/System.out: [I/SensorTag] Enabling gyro
2021-09-09 02:30:54.560 19943-19943/com.juul.sensortag D/Kable/Peripheral: Example write
    service: f000aa80-0451-4000-b000-000000000000
    characteristic: f000aa82-0451-4000-b000-000000000000
    writeType: WithoutResponse
    data: 7F 00

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