Add ComputeShuffledIndex algorithm. #6267
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This is described in: https://github.com/ethereum/consensus-specs/blob/dev/specs/phase0/beacon-chain.md#compute_shuffled_index.
I ran the prysm implementation locally to generate the expected outputs: https://github.com/prysmaticlabs/prysm/blob/babfc66c5bc5ca6635fbc7d786e22c8ccdc18c16/beacon-chain/core/helpers/shuffle.go#L73
Part of #5965