Add tests for classes in package pbapclient

This CL adds tests for:
- BluetoothPbapRequestPullPhoneBook
- BluetoothPbapRequestPullPhoneBookSize
- BluetoothPbapVcardList

Bug: 237467631
Test: Ran each test with atest
Change-Id: I10ea944064ece7da1c2c55b3f69c31adea760b22
(cherry picked from commit 3d4fd658)
Merged-In: I10ea944064ece7da1c2c55b3f69c31adea760b22