Organize websocket codebase

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/types/mod.rs

@@ -1,18 +1,12 @@
 pub mod api;
 pub mod asset;
 pub mod bar;
-pub mod class;
-pub mod exchange;
 pub mod source;
-pub mod status;
 pub mod websocket;
 
-pub use asset::Asset;
+pub use asset::{Asset, Class, Exchange, Status};
 pub use bar::Bar;
-pub use class::Class;
-pub use exchange::Exchange;
 pub use source::Source;
-pub use status::Status;
 
 #[derive(Clone, Debug)]
 pub enum BroadcastMessage {