Update adapter.rs

Fixed minor errors

Fixed compiler errors for trait BluetoothAdapter

Fixed errors in Mac struct of BluetoothAdapter

Added bluetooth-test functionality

Added bluetooth test as you suggested. Could you check if it is fine?

Removed enum type BluetoothAdapter

Removed create_session and create_device functions

Fixed issues in bluetooth-test

Also made changes to APIs that take adapter as a parameter

Implemented trait for EmptyAdapter

Renamed struct from BluetoothAdapter to EmptyAdapter and implemented trait BluetoothAdapter for the same.
This was done to make fn new() work in adapter.rs(for Empty)

Fixed errors in few methods

Made changes to fn new(), fn new_mock() and methods that use self.0.clone()

Moved create_mock_device to adapter.rs

Reverted changes in empty.rs

Modified fn new() for Empty

Modified fn new() for Mac, Android and Bluez

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