implement aes4 and aes10 with native instructions

Even though aes::hazmat::cipher_round uses aes-ni instructions under the
hood, simply loading the data (and the keys!) takes a significant amount
of time. Sadly, there's no way that aes exposes that lets you re-use the
"loaded" keys.

By implementing aes4/aes10 directly with _mm_aesenc, we can keep the
keys properly aligned.

We still keep the software backend as fallback, using the software
implementation of the aes crate.

This gives a ~70% speedup.

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