Starts adding rust in the toolchain

bench/programs_rust/hello_rust/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "hello_rust"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+fpga_lib = { path = "../fpga_lib" }

bench/programs_rust/hello_rust/src/main.rs

@@ -0,0 +1,18 @@
+#![no_std]
+#![no_main]
+
+use core::arch::asm;
+
+use fpga_lib::panic_handler;
+
+panic_handler! {}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _start() -> ! {
+    unsafe {
+        asm! {
+            "li x31, 0xdead0"
+        }
+    }
+    loop {}
+}