add return_adv argument to BleakScanner.find_device_by... methods

[dlech]

Similar to BleakScanner.discover() we also need a return_adv= argument added to the BleakScanner.find_device_by...() methods so we can get advertising data without using the deprecated BLEDevice.metadata.

https://bleak.readthedocs.io/en/latest/api/scanner.html#bleak.BleakScanner.discover

[siwyd]

This would be pretty handy for a specific use case I have. I'm using Bleak to fetch the Bluetooth address and RSSI of devices that we only know the name of. If I find two broadcasting at the same time, I want to give an error to the operator and if there are none broadcasting I want to discover it ASAP without having to wait. So my ideal flow would to do discover with 1s timeout and then do a longer find_device_by_name with a longer timeout. But I'm missing the advertisement data indeed to roll it out this simple. Thanks for the library though, super useful for my use case.