feat(benches): Choose v Shuffle with Benchmark

[refcell]

Description

Optimizes mev-boost-rs bid selection to use the O(1) rand::seq::SliceRandom::choose() over the O(n) rand::seq::SliceRandom::shuffle().

Benchmark included with improved time shown below.

[ralexstokes]

this is great! I would request to remove the formatting changes, but do like the benchmark and love the use of a better shuffle

are you available to iterate on this further? otherwise I may pick out the benchmark and algo swap stuff