Floss: Support Connection type

- Introduce a connection type to keep Bluetooth connection information.
- Remove duplicate Bluetooth Transport enum type.
- Fix typos.

Bug: 312653014
Test: mma packages/modules/Bluetooth && pts-bot GAP/BOND/BON/BV-01
Tag: #floss
Change-Id: I381fde05ce24faef3d2ba0a75f2b4a10aa0cc14b