Add gsio-client and gsio-wallet crates with initial implementations

- Introduced `gsio-client` crate for interacting with GSIO nodes, including ledger entry management and node discovery.
- Introduced `gsio-wallet` crate for key management, transaction creation, and wallet functionality.
- Updated workspace configuration to include new crates.

crates/gsio-client/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "gsio-client"
+version = "0.1.0"
+publish = false
+edition = "2024"
+license = "MIT"
+
+[dependencies]
+tokio = { version = "1.45.1", features = ["rt-multi-thread", "macros", "time", "net"] }
+tracing = { version = "0.1.41" }
+tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+uuid = { version = "1.7.0", features = ["v4", "serde"] }
+chrono = { version = "0.4.35", features = ["serde"] }
+reqwest = { version = "0.11", features = ["json"] }
+thiserror = "1.0"
+futures = "0.3.31"