Split out Rust BPF no-std stuff (#4968)

sdk/bpf/rust/rust-test/src/lib.rs

@@ -0,0 +1,13 @@
+//! @brief Solana Rust-based BPF program utility functions and types
+
+#[no_mangle]
+pub unsafe fn sol_log_(message: *const u8, length: u64) {
+    let slice = std::slice::from_raw_parts(message, length as usize);
+    let string = std::str::from_utf8(&slice).unwrap();
+    std::println!("{}", string);
+}
+
+#[no_mangle]
+pub fn sol_log_64_(arg1: u64, arg2: u64, arg3: u64, arg4: u64, arg5: u64) {
+    std::println!("{} {} {} {} {}", arg1, arg2, arg3, arg4, arg5);
+}