feat(lib): carry audio attributes in browse and folder listings

A browse listed each file as a name and a size, so a searcher who saw a
bitrate in a search reply lost it the moment they opened the sharer's
files. Listings (codes 5 and 37) now carry each file's attributes the
way Nicotine+ sends them, as a SharedFileEntry with name, size and
attributes in place of the (name, size) pair; the CLI's browse record
gains bitrate and duration, and the daemon protocol moves to version 2
for the new listing shape.

soulseek-rs-lib/src/lib.rs

@@ -30,7 +30,7 @@ pub mod prelude {
 pub use actor::server_actor::{PeerAddress, UserMessage};
 pub use client::{Client, ClientSettings};
 pub use error::{Result, SoulseekRs};
-pub use message::peer::SharedDirectory;
+pub use message::peer::{SharedDirectory, SharedFileEntry};
 pub use types::{
     ClientVersion, DownloadStatus, File, RoomEvent, RoomInfo, Search,
     SearchResult, SessionLoss, Transfer, UploadInfo, UploadStatus, UserInfo,