Add tests for nested classes in BluetoothPbapVcardManager

This CL adds tests for:
- BluetoothPbapVcardManager.ContactCursorFilter
- BluetoothPbapVcardManager.PropertySelector
- BluetoothPbapVcardManager.VCardFilter

Bug: 237467631
Test: atest BluetoothPbapVcardManagerNestedClassesTest
Change-Id: Iecbdeb1d591604d3f5403f06f9b1120973404acd
(cherry picked from commit 183b117a)
Merged-In: Iecbdeb1d591604d3f5403f06f9b1120973404acd