closes #14023

This change introduces a long-form CLI option --report-chars as an alternative to the existing
short -r option.

Here is a quick checklist that should be present in PRs.

• Include documentation when adding new features.
• Include new tests or update existing tests when applicable.
• Allow maintainers to push and squash when merging my commits. Please uncheck this if you prefer to squash the commits yourself.

If this change fixes an issue, please:

• Add text like closes #XYZW to the PR description and/or commits (where XYZW is the issue number). See the github docs for more information.

Unless your change is trivial or a small documentation fix (e.g., a typo or reword of a small section) please:

• Create a new changelog file in the changelog folder, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.

  Write sentences in the past or present tense, examples:

  • Improved verbose diff output with sequences.
  • Terminal summary statistics now use multiple colors.

  Also make sure to end the sentence with a ..

• Add yourself to AUTHORS in alphabetical order.