Add the AVRCP Connection Handler

This class handles connecting and disconnecting AVRCP Devices as well as
SDP lookups and feature selection.

Bug: 68854188
Test: run_host_unit_tests.py && run_unit_tests.sh net_test_avrcp
Change-Id: I950587123d2875c4333b415c379c7c1fb0c29ca5
(cherry picked from commit 8e521034ded85c26152a18dd591192df3b80d958)
Merged-In: I43720566bc7b96a4796a1f571757f2a8c198be17