Remove IbcEventType

[plafer]

Closes: #623

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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: 34.63% and project coverage change: -0.23 ⚠️

Comparison is base (014fec6) 73.19% compared to head (4f5218f) 72.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #624      +/-   ##
==========================================
- Coverage   73.19%   72.97%   -0.23%     
==========================================
  Files         125      125              
  Lines       15660    15647      -13     
==========================================
- Hits        11463    11418      -45     
- Misses       4197     4229      +32     

Impacted Files	Coverage Δ
crates/ibc/src/core/handler.rs	74.64% <ø> (ø)
crates/ibc/src/events.rs	18.88% <4.65%> (-13.65%)	⬇️
crates/ibc/src/core/ics04_channel/events.rs	44.92% <27.58%> (-2.00%)	⬇️
crates/ibc/src/core/ics02_client/events.rs	70.90% <48.00%> (-3.14%)	⬇️
crates/ibc/src/core/context/acknowledgement.rs	97.44% <50.00%> (ø)
crates/ibc/src/core/context/chan_close_confirm.rs	96.39% <50.00%> (ø)
crates/ibc/src/core/context/chan_close_init.rs	96.55% <50.00%> (ø)
crates/ibc/src/core/context/chan_open_ack.rs	96.85% <50.00%> (ø)
crates/ibc/src/core/context/chan_open_confirm.rs	96.92% <50.00%> (ø)
crates/ibc/src/core/context/chan_open_init.rs	96.74% <50.00%> (ø)
... and 12 more

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[Farhad-Shabani]

Looks good to me 🙏