PBAP performance

Change behavior of onPullComplete to group insert operations for
contacts and apply together.  This batching of operations reduces cross
process communications and improves performace about 3x from 100 seconds
for 1000 contacts to 34.

Bug: 27343808
Test: SL4A test BtCarPbapTest:test_contact_download.
Change-Id: I56bc23c69bc93cf44f2a8e132dea8dce8de109dc