support parallel execution of cosmos TokenSend txs

[LeoGuo621]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [x] 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 to the Unreleased section in CHANGELOG.md

• [ ] Reviewed 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 PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #3221 (d293ae0) into dev (6b97af6) will increase coverage by 0.00%. The diff coverage is 0.00%.

:exclamation: Current head d293ae0 differs from pull request most recent head b3db74d. Consider uploading reports for the commit b3db74d to get more accurate results

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@@           Coverage Diff           @@
##              dev    #3221   +/-   ##
=======================================
  Coverage   36.54%   36.55%           
=======================================
  Files         446      446           
  Lines       46857    46859    +2     
=======================================
+ Hits        17123    17127    +4     
+ Misses      28463    28462    -1     
+ Partials     1271     1270    -1     

Files Changed	Coverage Δ
x/token/types/msgs.go	84.57% <0.00%> (-0.91%)	:arrow_down:

... and 1 file with indirect coverage changes