📦️ Package correlations

[shnizzedy]

Fixes

calculate_correlations.py in amygutierrez/regression_dashboard and cpac_correlations.py in this repo were the same file with recent parallel modifications.

Description

This PR

1. merges those changes back into a single source of truth (in this repo, to be imported in the other repo)
2. moves the script into its own module with packaging info for ease of use elsewhere
3. cherry-picks the pre-commit hooks from C-PAC

Technical details

The GitHub diff on the PR is showing deleted & new files for the moved path, but you can see the diff from the merge here + here

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the main branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I updated the changelog.
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[shnizzedy]

I'm marking [marked] this as a draft, blocked by sgiavasis#4 because I want[ed] those changes reflected here and I'll backmerge[d] them here before (/ if) we merge this one

[sgiavasis]

🙏