tests: Bluetooth: BR: Add GAP Server role test suite

IUT works as a GAP Server (Peripheral) in the Bluetooth system. The peer
device, GAP Client,
is a PC running Bumble as a test tool.

This test suite implements the following test cases:
Case 1, Non-connectable Mode Testing. Verifies DUT can operate in
non-connectable mode without allowing connections.
Case 2, Connectable Non-discoverable Mode with Active Disconnection.
Verifies DUT can accept connections and initiate disconnection.
Case 3, Connectable Non-discoverable Mode with Passive Disconnection.
Verifies DUT can accept connections and handle passive disconnection.
Case 4, Connectable Non-discoverable Mode with Connection Rejection.
Verifies DUT can reject connection requests.
Case 5, Limited Discoverable Mode with Active Disconnection. Verifies
DUT in limited discoverable mode can be discovered, accept connections
and initiate disconnection.
Case 6, Limited Discoverable Mode with Passive Disconnection. Verifies
DUT can be discovered, accept connections and handle passive
disconnection.
Case 7, Limited Discoverable Mode with Connection Rejection. Verifies
DUT can be discovered but reject connection requests.
Case 8, General Discoverable Mode with Active Disconnection. Verifies
DUT in general discoverable mode can be discovered, accept connections
and initiate disconnection.
Case 9, General Discoverable Mode with Passive Disconnection. Verifies
DUT can be discovered, accept connections and handle passive
disconnection.
Case 10, General Discoverable Mode with Connection Rejection. Verifies
DUT can be discovered but reject connection requests.

Signed-off-by: Jiawei Yang <jiawei.yang_1@nxp.com>