fix: missing event emissions(EventSetSwap, EventAddDenomMetadata) (backport #1385)

[mergify]

Description

closes: #XXXX

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

---

This is an automatic backport of pull request #1385 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of baab526 has failed:

On branch mergify/bp/release/v0.49.x/pr-1385
Your branch is up to date with 'origin/release/v0.49.x'.

You are currently cherry-picking commit baab52684.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/core/proto-docs.md
	modified:   proto/lbm/fswap/v1/event.proto
	modified:   x/fswap/keeper/keeper.go
	modified:   x/fswap/keeper/keeper_test.go
	modified:   x/fswap/types/event.pb.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 68.93%. Comparing base (2b4474c) to head (641bda2).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.49.x    #1386      +/-   ##
===================================================
- Coverage            68.93%   68.93%   -0.01%     
===================================================
  Files                  671      671              
  Lines                69256    69260       +4     
===================================================
- Hits                 47743    47742       -1     
- Misses               19233    19236       +3     
- Partials              2280     2282       +2     

Files	Coverage Δ
x/fswap/keeper/keeper.go	45.90% <20.00%> (-0.67%)	⬇️

... and 1 file with indirect coverage changes