tests: Bluetooth: BR: Add test suite of bonding for SMP

IUT works as an SM Initiator/Responder. The peer device,
SM Responder/Initiator, is a PC running bumble on it.

Add shell commands to create and manage L2CAP server and channel with
different security level.

In the test suite, there are 5 test cases. The test matrix combines
each bonding flag:
| Test Case ID | Initiator | Responder | Expected Result |
|--------------|-----------|-----------|-----------------|
| BR_SM_Bonding_INIT_001 | Non-bondable | Non-bondable | Pass |
| BR_SM_Bonding_INIT_005 | General Bonding | General Bonding | Pass |
| BR_SM_Bonding_RSP_010 | Non-bondable | Non-bondable | Pass |
| BR_SM_Bonding_RSP_011 | General Bonding | Non-bondable | Fail |
| BR_SM_Bonding_RSP_014 | General Bonding | General Bonding | Pass |

Signed-off-by: Can Wang <can.wang@nxp.com>