Added `BaseColumnMutSlice`.

[Alon-Ti]

This change is 

[Alon-Ti]

• #755
• #754
• #751
• #750
• #749 👈
• #748
• dev

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.

Project coverage is 93.05%. Comparing base (82d7ab5) to head (93aa725).

Files	Patch %	Lines
crates/prover/src/core/backend/simd/column.rs	88.88%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## col-chunks0 #749 +/- ## =============================================== - Coverage 93.06% 93.05% -0.02% =============================================== Files 86 86 Lines 11213 11240 +27 Branches 11213 11240 +27 =============================================== + Hits 10435 10459 +24 - Misses 685 688 +3 Partials 93 93 ```

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[Alon-Ti]

Merge activity

• Jul 23, 7:29 AM EDT: @Alon-Ti started a stack merge that includes this pull request via Graphite.
• Jul 23, 10:27 AM EDT: Graphite couldn't merge this pull request because a downstack PR #748 failed to merge.
• Jul 23, 10:28 AM EDT: @Alon-Ti started a stack merge that includes this pull request via Graphite.
• Jul 23, 10:28 AM EDT: Graphite couldn't merge this pull request because a downstack PR #748 failed to merge.
• Jul 23, 10:28 AM EDT: @Alon-Ti started a stack merge that includes this pull request via Graphite.
• Jul 23, 10:29 AM EDT: Graphite couldn't merge this pull request because a downstack PR #748 failed to merge.
• Jul 24, 8:44 AM EDT: @Alon-Ti merged this pull request with Graphite.