update x/gov to match module spec

[fedekunze]

• 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 a relevant changelog entry: clog add [section] [stanza] [message]

• 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 #4665 into master will decrease coverage by 0.25%.
The diff coverage is 60.8%.

@@            Coverage Diff             @@
##           master    #4665      +/-   ##
==========================================
- Coverage    54.3%   54.04%   -0.26%     
==========================================
  Files         271      269       -2     
  Lines       17344    17114     -230     
==========================================
- Hits         9418     9249     -169     
+ Misses       7228     7179      -49     
+ Partials      698      686      -12

[fedekunze]

To introduce the internal/ pkg, we'd have to move to exported/ the Content and Handler interfaces as well as NewMsgSubmitProposal, codec's RegisterProposalType(Codec), ValidateAbstract, etc.

Do we want to do that or should we leave it as is? @rigelrozanski @alexanderbez

[alexanderbez]

Blocking until review of proposal registration process

[rigelrozanski]

Dopeness - much needed cleanup - left a few comments worth addressing

[rigelrozanski]

This should be consolidated to a key function per my previous comments too

[alexanderbez]

ACK