Inheritance of __init__ doesn't follow normal rules, so the type checker
isn't liking it.

Drop the method from the abstract base class and make it private in the
backend implementations.

Make it clear which methods are overriding the base class.

This was not implemented on most backends.

BlueZ handles it during the start scan method.

Indicate overridden methods from base class.

Other backends don't have this, so android shouldn't either.

The name can be None.

BlueZ will use the address of a Bluetooth device as the name if it
doesn't have a name. All other platforms will use None. So to be
consistent, make the BlueZ backend use None as well.