Specify which shuffling algorithm is used

[AnomalRoil]

We could use the one from Kevin:

          We could use https://docs.fairy.dev/theory/lazy-merkle-raffle/

Originally posted by @CluEleSsUK in #1 (comment)

but in truth we should probably benchmark a few shuffling algorithm in Rust, Go and Solidity and do a nice blog about which one we chose based on the data. cc @najienka

[AnomalRoil]

Assigning this to you @najienka since the differences will most likely be gas cost.
We should implement 3 different algorithms and test them.