WIP: Add global unbonding/redelegation index

[cwgoes]

Nothing to see yet. I think we should use an array instead (see #1402).

• 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 #
• rereviewed Files changed in the github PR explorer

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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 #2929 into develop will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2929      +/-   ##
===========================================
- Coverage    55.53%   55.51%   -0.03%     
===========================================
  Files          120      120              
  Lines         8490     8490              
===========================================
- Hits          4715     4713       -2     
- Misses        3453     3455       +2     
  Partials       322      322

[rigelrozanski]

Can I take over this issue? Unless you're actively working on this?

[cwgoes]

Can I take over this issue? Unless you're actively working on this?

By all means! Sorry for the abandoned PR.

[rigelrozanski]

closing in favour of #3243