Modernizing Haiku’s Bluetooth stack: Implementing support for HFP profile

Currently, Haiku's Bluetooth stack only supports basic device pairing, with no Bluetooth profiles implemented yet. I plan to implement the Hands-Free Profile (HFP), which will enable users to connect their earphones or headphones to listen to audio and make hands-free calls. The deliverables for this proposal include working implementations of the HFP and SPP profiles, as well as RFCOMM and SCO. Additionally, the RFCOMM implementation will lay the groundwork for other profiles, such as the File Transfer Profile (FTP).