R4R: Cmds for validator unbondings and redelegations

[fedekunze]

Closes #2566

---

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added entries in PENDING.md with issue #

• Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #2569 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2569   +/-   ##
========================================
  Coverage    58.81%   58.81%           
========================================
  Files          152      152           
  Lines         9420     9420           
========================================
  Hits          5540     5540           
  Misses        3510     3510           
  Partials       370      370

[fedekunze]

@cwgoes @alexanderbez The option to optionally indent the response needs to be done on most cmds (not only on these ones). I need to update the queriers to be able to do that as well. I'll tackle that on #2582

[fedekunze]

@alexanderbez @cwgoes @jackzampolin this should be ready for a final review and merge

[alexanderbez]

LGTM 👍

[cwgoes]

utACK, 🌵