Move events to submodules

[sug0]

Describe your changes

Move Event and associated types from namada_core to the new namada_events crate. Module-specific events (such as IbcEvent and EthBridgeEvent) were moved to their respective crates (namada_ibc and namada_ethereum_bridge).

NOTE: IBC e2e tests are expected to fail, just like in the base PR.

Indicate on which release or other PRs this topic is based on

#3088

Diff for review: https://github.com/anoma/namada/compare/tiago/emit-generic-events-wasm..tiago/move-events-to-submodules (https://github.com/anoma/namada/pull/3102/files/0ac23e8a2d514d30a94abb42eafc8c0d6f5ccebd..44d0cdbce373910043013bc75da8cd91a4408cee)

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state

[codecov]

Codecov Report

Attention: Patch coverage is 62.74876% with 599 lines in your changes are missing coverage. Please review.

Project coverage is 59.61%. Comparing base (ea843f7) to head (68420a5).
Report is 7 commits behind head on main.

Files	Patch %	Lines
crates/ibc/src/event.rs	46.94%	113 Missing ⚠️
...tes/apps/src/lib/node/ledger/shell/testing/node.rs	0.00%	88 Missing ⚠️
crates/events/src/extend.rs	73.96%	88 Missing ⚠️
crates/events/src/lib.rs	72.68%	62 Missing ⚠️
crates/governance/src/event.rs	52.21%	54 Missing ⚠️
crates/sdk/src/rpc.rs	0.00%	32 Missing ⚠️
...s/apps/src/lib/node/ledger/shell/finalize_block.rs	29.41%	24 Missing ⚠️
crates/sdk/src/events/log/dumb_queries.rs	82.75%	20 Missing ⚠️
crates/sdk/src/masp.rs	0.00%	18 Missing ⚠️
crates/ethereum_bridge/src/event.rs	71.69%	15 Missing ⚠️
... and 16 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3102      +/-   ##
==========================================
+ Coverage   59.41%   59.61%   +0.20%     
==========================================
  Files         298      300       +2     
  Lines       92326    92917     +591     
==========================================
+ Hits        54853    55394     +541     
- Misses      37473    37523      +50     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sug0]

ci is temporarily borked due to sccache

[grarco]

Just one comment but looks good to me!