lsps: Implement JSON-RPC V2 client

Adds an async safe JSON-RPC V2 client for a generic transport layer. The
transport layer we will use later on are BOLT8 lightning messages.

Signed-off-by: Peter Neuroth <[email protected]>

Author: nepet

Cargo.lock

@@ -4,5 +4,12 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+async-trait = "0.1"
+dashmap = "6.1"
+hex = "0.4"
+log = "0.4"
+rand = "0.9"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+thiserror = "2.0"
+tokio = { version = "1.44", features = ["full"] }