Bluetooth: tester: Support feature ISO sync receiver

Add command `BTP_GAP_BIG_CREATE_SYNC` to create BIG sync establishment.

Add event `BTP_GAP_EV_BIG_SYNC_ESTABLISHED` to notify the event that
the BIG sync is established.

Add event `BTP_GAP_EV_BIG_SYNC_LOST` to notify the event that the BIG
sync is lost.

Add event `BTP_GAP_EV_BIS_DATA_PATH_SETUP` to notify the event that
the data path of the BIS is setup.

Add event `BTP_GAP_EV_BIS_STREAM_RECEIVED` to notify the received BIS
stream data.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>