feat: commandhandler now has functions to edit/get/delete responses

[Jaskowicz1]

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This PR adds functions to dpp::commandhandler to allow users to edit, get, and delete, responses. Whilst dpp::commandhandler is deprecated, we still have a good few people using it.

Code change checklist

• [x] I have ensured that all methods and functions are fully documented using doxygen style comments.
• [x] My code follows the coding style guide.
• [ ] I tested that my change works before raising the PR.
• [x] I have ensured that I did not break any existing API calls.
• [x] I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[braindigitalis]

any movement on this?

[Jaskowicz1]

Closing, we are officially deprecating command handler so we should not support new features.