Add additional commands

[johlju]

Pull Request (PR) description

• Public commands:
  • Out-Diff
  • Get-NumericalSequence
  • Split-StringAtIndices
  • ConvertTo-DiffString

This Pull Request (PR) fixes the following issues

None.

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [ ] Documentation added/updated in README.md and source/WikiSource.
• [ ] Comment-based help added/updated for all new/changed functions.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [x] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where applicable). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

---

This change is 

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.25581% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98%. Comparing base (caf584d) to head (f27404e).

Files	Patch %	Lines
source/Public/Out-Diff.ps1	96%	3 Missing :warning:

Additional details and impacted files

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