Add events for Pool Reinitialize case, Fix event type for refund

[dongsam]

Description

• Add Event emitting missing in Pool Reinitialize situation
• Fix Event type in Refund Depoist/Withdraw

---

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 #238 (0759888) into develop (5ec243f) will increase coverage by 0.11%.
The diff coverage is 95.23%.

@@             Coverage Diff             @@
##           develop     #238      +/-   ##
===========================================
+ Coverage    82.93%   83.04%   +0.11%     
===========================================
  Files           20       20              
  Lines         2215     2230      +15     
===========================================
+ Hits          1837     1852      +15     
  Misses         208      208              
  Partials       170      170              

Impacted Files	Coverage Δ
x/liquidity/keeper/liquidity_pool.go	79.24% <95.23%> (+0.57%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5ec243f...0759888. Read the comment docs.