Shrink endpoint runtime footprint

examples/endpoint_test/src/main.rs

@@ -0,0 +1,19 @@
+#![no_std]
+#![no_main]
+
+extern crate alloc;
+
+use leaf_shell::{ShellLeaf, ShellState};
+use unshell::protocol::{Endpoint, Leaf};
+
+const ID: u32 = 0x12345678;
+
+#[unsafe(no_mangle)]
+pub fn main(_argc: i32, _argv: *const *const u8) {
+    let mut endpoint = Endpoint::new(ID);
+    let mut shell = ShellLeaf::new(ShellState::new());
+
+    loop {
+        shell.update(&mut endpoint);
+    }
+}