Refactor crate into multiple subcrates

protos/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "protos"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

protos/src/lib.rs

@@ -0,0 +1,3 @@
+pub fn hello() {
+    println!("Hello from protos!");
+}