Add export preprocessed roots dev util.

[gilbens-starkware]

This change is 

[gilbens-starkware]

• Lower max supported blowup factor to 2. #1421
• Add export preprocessed roots dev util. #1420 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[alon-f]

Reviewable status: 0 of 7 files reviewed, 1 unresolved discussion (waiting on @anatgstarkware)

---

stwo_cairo_prover/crates/prover/src/witness/preprocessed_trace.rs line 21 at r2 (raw file):

{
    let preprocessed_trace = preprocessed_trace.to_preprocessed_trace();

This was a very heated debate among the old team and we decided to have an empty line before a new "section" but we can reopen this discussion lol

[alon-f]

@alon-f reviewed 2 of 7 files at r1, 5 of 5 files at r2.
Reviewable status: all files reviewed (commit messages unreviewed), 1 unresolved discussion (waiting on @anatgstarkware and @gilbens-starkware)

[anatgstarkware]

Reviewable status: all files reviewed (commit messages unreviewed), 2 unresolved discussions (waiting on @gilbens-starkware)

---

stwo_cairo_prover/crates/dev_utils/src/lib.rs line 1 at r2 (raw file):

pub mod preprocessed_roots;

How about moving this code to prover/utils?

Code quote:

pub mod preprocessed_roots;