Feat: Add 'replace_pattern' entry for DictComparator and several related save capabilities

[adrien-berchet]

Description

• Add some save() capabilities to the comparators based on the DictComparator.
• Add an optional replace_pattern entry to the comparators based on the DictComparator.

Checklist

This pull request is:

• A documentation / typographical error fix
  • Good to go, no issue or tests are needed
• A short code fix
  • Please include: Fixes: #<issue number> in the description if it solves an existing issue
    (which must include a complete example of the issue).
  • Please include tests that fail with the main branch and pass with the provided fix.
• A new feature implementation or update an existing feature
  • Please include: Fixes: #<issue number> in the description if it solves an existing issue
    (which must include a complete example of the feature).
  • Please include tests that cover every lines of the new/updated feature.
  • Please update the documentation to describe the new/updated feature.