setPhy support in ScanSettings.Builder

[jimboboliver]

Is your feature request related to a problem? Please describe.
On new BLE 5.0+ devices can advertise long range using coded PHY. RxAndroidBle does not currently seem to have a way to configure for discovery over coded PHY. The RxAndroidBle ScanSettings.Builder only offers a subset of what is available in the Android ScanSettings.Builder.

Describe the solution you'd like
I'd like to be able to configure a device scan to use all supported PHY using the RxAndroidBle ScanSettings.Builder.
Here is a link to the ScanSettings.Builder setPhy

Additional context
My development is actually using the RxAndroidBle through react-native-ble-plx -> MultiPlatformBleAdapter -> RxAndroidBle. I've managed to successfully setPreferredPhy once connected using a RxBleCustomOperation in MultiPlatformBleAdapter (thank you for making this possible).

Please let me know if there is currently a way to setPhy myself or whether this is a possible feature.

[jimboboliver]

Additionally, is there any plan to add onPhyUpdate to the RxBleGattCallback's nativeCallbackDispatchers?