Add integration tests for auth and end-to-end proxying (#4)

* Add authentication handshake tests

* Add basic proxy test

* Add mismatched secret failure test

* Add a failure test for invalid addresses

Cargo.toml

@@ -28,3 +28,7 @@ tokio = { version = "1.17.0", features = ["full"] }
 tracing = "0.1.32"
 tracing-subscriber = "0.3.10"
 uuid = { version = "0.8.2", features = ["serde", "v4"] }
+
+[dev-dependencies]
+lazy_static = "1.4.0"
+rstest = "0.12.0"