Add bench command

Makefile

@@ -3,6 +3,9 @@
 precommit:
 	@bash .githooks/pre-push
 
+bench:
+	RUSTFLAGS='--cfg=bench' cargo +nightly bench -p nostr
+
 clean:
 	cargo clean
 

crates/nostr/src/lib.rs

@@ -7,6 +7,7 @@
 #![warn(missing_docs)]
 #![warn(rustdoc::bare_urls)]
 #![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(bench, feature(test))]
 //#![cfg_attr(all(not(feature = "std"), feature = "alloc"), feature(error_in_core))]
 #![cfg_attr(
     feature = "default",
@@ -16,6 +17,9 @@
 #[cfg(not(any(feature = "std", feature = "alloc")))]
 compile_error!("at least one of the `std` or `alloc` features must be enabled");
 
+#[cfg(bench)]
+extern crate test;
+
 #[cfg(feature = "std")]
 #[macro_use]
 extern crate std;