Add get_preprocessed_column api.

[ilyalesokhin-starkware]

No description provided.

[reviewable-StarkWare]

This change is 

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.90%. Comparing base (feb141a) to head (0bed209).

Files with missing lines	Patch %	Lines
...r/src/constraint_framework/preprocessed_columns.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #867      +/-   ##
==========================================
- Coverage   91.91%   91.90%   -0.01%     
==========================================
  Files          92       92              
  Lines       12599    12604       +5     
  Branches    12599    12604       +5     
==========================================
+ Hits        11580    11584       +4     
- Misses        909      910       +1     
  Partials      110      110              

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⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 2.

Benchmark suite	Current: ed87f62	Previous: f6214d1	Ratio
merkle throughput/simd merkle	30281991 ns/iter (± 515705)	14690867 ns/iter (± 434150)	2.06

This comment was automatically generated by workflow using github-action-benchmark.

CC: @shaharsamocha7

[ohad-starkware]

Reviewed 8 of 8 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ilyalesokhin-starkware)

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crates/prover/src/constraint_framework/preprocessed_columns.rs line 10 at r1 (raw file):

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum PreprocessedColumn {

I think it should be defined outside the constraint framework, maybe even in a separate crate when its defined by the air infra
but it's fine for now, add a todo?

[ilyalesokhin-starkware]

Reviewable status: 7 of 8 files reviewed, all discussions resolved (waiting on @ohad-starkware)

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crates/prover/src/constraint_framework/preprocessed_columns.rs line 10 at r1 (raw file):

Previously, ohad-starkware (Ohad) wrote…

I think it should be defined outside the constraint framework, maybe even in a separate crate when its defined by the air infra
but it's fine for now, add a todo?

done

[ohad-starkware]

Reviewable status: 7 of 8 files reviewed, all discussions resolved (waiting on @ilyalesokhin-starkware)

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crates/prover/src/constraint_framework/preprocessed_columns.rs line 10 at r1 (raw file):

Previously, ilyalesokhin-starkware wrote…

done

nice

[ohad-starkware]

Reviewable status: 7 of 8 files reviewed, all discussions resolved (waiting on @ilyalesokhin-starkware)