Improve MsgTransfer

[plafer]

Closes: #567

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests.
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[codecov]

Codecov Report

Patch coverage: 81.25% and project coverage change: -0.04 ⚠️

Comparison is base (8cc943d) 73.02% compared to head (5b02b15) 72.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
- Coverage   73.02%   72.99%   -0.04%     
==========================================
  Files         126      126              
  Lines       15679    15672       -7     
==========================================
- Hits        11450    11439      -11     
- Misses       4229     4233       +4     

Impacted Files	Coverage Δ
...tes/ibc/src/applications/transfer/msgs/transfer.rs	45.79% <53.57%> (-0.75%)	⬇️
...c/src/applications/transfer/relay/send_transfer.rs	95.41% <96.07%> (-0.42%)	⬇️
crates/ibc/src/core/handler.rs	74.64% <100.00%> (ø)

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[Farhad-Shabani]

All set.
There is just an inconsistency with the naming of some fields and methods I remember you also mentioned this before. Some places we use "token" and other times we use "coin". Do we need to deal with that in a later PR?

[plafer]

yes I can always do that in the next PR 👍