HMAC-SM3 by hmac_sm3

```rust let message = b"Hello World"; let key = b"TestSecret";

let hmac1 = hmacsm3(key, message); asserteq!("9d91da552268ddf11b9f69662773a66c6375b250336dfb9293e7e2611c36d79f", hex::encode(hmac1)); ```

or use stream style:

rust let mut hm = HmacSm3::new(key); hm.update(b"Hello"); hm.update(b" "); hm.update(b"World"); let hmac2 = hm.finalize(); assert_eq!("9d91da552268ddf11b9f69662773a66c6375b250336dfb9293e7e2611c36d79f", hex::encode(hmac2));

Benchmark @MacBook Pro (Retina, 15-inch, Late 2013/2 GHz Quad-Core Intel Core i7) text $ cargo run --release --example bench HMAC-SM3 : 219.19 M/s HMAC-SHA1 : 228.57 M/s HMAC-SHA256 : 204.96 M/s