remove parts of amino from ibc

[colin-axner]

Description

removes amino entirely from:

• connections
• channels
• ibc-transfer

the rest of the amino references are non-trivial to remove and will be done in followup prs

ref: #6566

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• 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.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #6819 into master will increase coverage by 5.97%.
The diff coverage is 55.73%.

@@            Coverage Diff             @@
##           master    #6819      +/-   ##
==========================================
+ Coverage   55.60%   61.57%   +5.97%     
==========================================
  Files         457      518      +61     
  Lines       27440    32003    +4563     
==========================================
+ Hits        15257    19707    +4450     
+ Misses      11083    10719     -364     
- Partials     1100     1577     +477