benches: introduce minimal decoding performance test

Cargo.toml

@@ -17,10 +17,14 @@ minicbor = { version = "0.25", features = ["alloc"] }
 rand_xoshiro = "0.7"
 
 [dev-dependencies]
+criterion = "0.5"
 hex = "0.4"
 qrcode = { version = "0.14", default-features = false }
 
 [features]
 default = ["std"]
 std = []
 
+[[bench]]
+name = "decode"
+harness = false

benches/decode.rs

@@ -0,0 +1,9 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use ur::decode;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("decode bytes", |b| b.iter(|| decode(black_box("ur:bytes/hdeymejtswhhylkepmykhhtsytsnoyoyaxaedsuttydmmhhpktpmsrjtgwdpfnsboxgwlbaawzuefywkdplrsrjynbvygabwjldapfcsdwkbrkch"))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);