Clarify DRep queries with an all-or-some logic

[carlhammann]

Changelog

- description: |
    Make queries that optionally filter their result by DRep keys more explicit:
    - `cardano-cli conway query drep-state`
    - `cardano-cli conway query drep-stake-distribution`
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  - improvement    # QoL changes e.g. refactoring
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

This is in the same spirit as #541. I'm targeting the branch of that PR here, to make the diff clearer. When #541 is merged, that'll be the diff to main.

I also deleted a few unused parsers in Cardano.CLI.EraBased.Options.Common.

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff