[ws client]: add `wss` test + refactor `WebSocketTransport builder` (#209)

* test(ws client): wss (TLS)

* fix(ws client): bug replace target with host.

* address review suggestions

* tests: add tests for non-ascii URLs

* refactor: impl TryFrom for WebSocketTransportBuild

* fix nit: try to connect to all sockaddrs

* document `Host type`

* doc(ws client): default port.

* remove helper function