feat: [sesam-vitale] Use thiserror, anyhow and expect to properly handle errors instead of unwrap

crates/sesam-vitale/src/main.rs

@@ -3,6 +3,8 @@ mod libssv;
 mod ssv_memory;
 mod ssvlib_demo;
 
-fn main() {
-    ssvlib_demo::demo();
+use anyhow::{Context, Result};
+
+fn main() -> Result<()> {
+    ssvlib_demo::demo().context("Error while running the SSV library demo")
 }