Add bech32ibc20 logic to v5 upgrade

[ValarDragon]

Closes: #601

Description

Adds the work from the bech32ibc repository into this one. We should ideally switch to a tagged version of that repository before release.

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

[codecov-commenter]

Codecov Report

Merging #637 (e4b3b29) into main (df577b7) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #637      +/-   ##
==========================================
- Coverage   18.44%   18.43%   -0.02%     
==========================================
  Files         172      172              
  Lines       24235    24250      +15     
==========================================
  Hits         4470     4470              
- Misses      19000    19015      +15     
  Partials      765      765              

Impacted Files	Coverage Δ
app/app.go	0.53% <0.00%> (-0.03%)	⬇️

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