Add CachedBluetoothDeviceManager test case for csip set member device logic

The patch contains two topic.
1. Add test case for csip set member device add/remove logic
2. Fix clearNonBondedDevices issue. Remove object from set as iterating, it would cause ConcurrentModificationException, make a copy as iterating to achieve the safe remove.

Bug: 205507889
Bug: 150670922
Bug: 178981521
Test: make -j50 RunSettingsLibRoboTests ROBOTEST_FILTER=CachedBluetoothDeviceManagerTest
Change-Id: I3fa3fd9a9e13e011ce2ce01a8142511c86ccbf1c