Refactor transports to construct them specific for each application

Instead of splitting up the transports into capabilities, we compose
them directly for each application. This allows us to remove the
websocket transport for the CLI which is really only needed for the
ASB to allow retrieval of quotes via the browser.

swap/src/cli.rs

@@ -1,2 +1,3 @@
 pub mod command;
 pub mod tracing;
+pub mod transport;