These are on the slower side and could be improved. No performance optimizations
yet have been done.

```
Cpu: Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
```

-- Sha3-256

```
Zig --release-fast
    93 Mb/s
Zig --release-safe
    99 Mb/s
Zig
    4 Mb/s
```

-- Sha3-512

```
Zig --release-fast
    49 Mb/s
Zig --release-safe
    54 Mb/s
Zig
    2 Mb/s
```

Interestingly, release-safe is producing slightly better code than
release-fast.