Ex_sha3: Pure Elixir implementation of sha3 AND keccak-1600-f

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Thanks @Schultzer’s pull request and a faster rol() implementation we’ve got a new version now, that is still pure Elixir but nearly 10x faster… That said it’s still much slower than the nif:

##### With input long  string #####
Comparison: 
 nif_sha3_256       2243.02
  ex_sha3_256          9.36 - 239.60x slower +106.37 ms

##### With input short string #####
Comparison: 
 nif_sha3_256     215033.52
  ex_sha3_256        870.25 - 247.09x slower +1.14 ms
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