Add tests for pythd JRPC API server

Author: tompntn

Cargo.toml

@@ -31,3 +31,13 @@ solana-shadow = "0.2.4"
 slog-async = "2.7.0"
 config = "0.13.2"
 thiserror = "1.0.32"
+
+[dev-dependencies]
+tokio-util = { version = "0.7.0", features = ["full"] }
+soketto = "0.7.1"
+mockall = "0.11.0"
+portpicker = "0.1.1"
+rand = "0.8.5"
+tokio-retry = "0.3.0"
+slog-extlog = "8.0.0"
+iobuffer = "0.2.0"