tari-project / tari-crypto / 11315931836

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chore: protect public key zeroization against updates (#235)

Ristretto public key zeroizing is done manually due to the use of
`OnceCell`. I recently came across a [clever design
pattern](https://github.com/BLAKE3-team/BLAKE3/blob/master/src/lib.rs#L447-L466)
that uses destructuring. The idea is that future changes to the
underlying struct will trigger a compiler error to ensure that the
zeroization implementation is also updated.

This PR implements such a change.

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