[#36] Dry run mode added

[DK318]

Description

Problem

copy/rename/delete commands are capable of performing multiple operations at once. Those operations can also be destructive.

Solution

Added [--dry-run | -d] mode for these operations which just shows that would be done.

Related issue(s)

• Fixes #36

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Related changes (conditional)

• Tests

  • [x] If I added new functionality, I added tests covering it.
  • [x] If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.

• Documentation

  • [x] I checked whether I should update the docs and did so if necessary:
  • README
  • Haddock

• Public contracts

  • [x] Any modifications of public contracts comply with the Evolution of Public Contracts policy.
  • [x] I added an entry to the changelog if my changes are visible to the users and
  • [x] provided a migration guide for breaking changes if possible

Stylistic guide (mandatory)

• [x] My commits comply with the policy used in Serokell.
• [x] My code complies with the style guide.

[dcastro]

Please change this PR's target branch from dk318/#12-rename-command-implementation to main, and then click "Delete branch" in #13.