Any public traits that takes a `&[T]` as argument should be rewriten to accept an Iterator instead

[tdelabro]

This is important for performance reasons.
It avoids needless .collect on the caller side.

It's also perfectly backward-compatible.

[ExactSizeIterator](https://doc.rust-lang.org/std/iter/trait.ExactSizeIterator.html] can be used instead for the cases where the method was using the size of the array (input.len())

Eg.:

blockifier/crates/blockifier/src/blockifier/transaction_executor.rs

Line 179 in eb4958a

pub fn execute_txs(