refactor(runtime): derive Clone for KeccakState instead of manual impl

[0xxFloki]

Removes redundant manual Clone implementation for KeccakState<P> by using #[derive(Clone)] instead.

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[0xxFloki]

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[slumber]

This code is a part of forked tiny_keccak, I would suggest against modifying it.

Original implementation is manual probably to avoid putting bounds on generic parameter.