[Feature] add ibc ante to prevent duplicate packet from relayer

[yun-yeo]

Summary of changes

Append IBC ante decorator to reject transactions that only contain redundant packet messages. This will prevent relayers from wasting fees by submitting messages for packets that have already been processed by previous relayer(s). The Antedecorator is only applied on CheckTx and RecheckTx and is therefore optional for each node.

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated API documentation (client/lcd/swagger-ui/swagger.yaml)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

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(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[codecov]

Codecov Report

Merging #583 (a4c4896) into main (1581f2f) will increase coverage by 0.00%.
The diff coverage is 11.11%.

@@           Coverage Diff           @@
##             main     #583   +/-   ##
=======================================
  Coverage   44.75%   44.75%           
=======================================
  Files         121      121           
  Lines        6998     7000    +2     
=======================================
+ Hits         3132     3133    +1     
- Misses       3620     3621    +1     
  Partials      246      246           

Impacted Files	Coverage Δ
app/app.go	0.67% <0.00%> (-0.01%)	⬇️
custom/auth/ante/ante.go	60.00% <100.00%> (+1.37%)	⬆️