Read or write to event attributes with dynamically alloc'd keys

[sug0]

Describe your changes

Closes #3178

Required by #3103

Add the ability to read or write to event attributes with dynamically allocated attribute keys.

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

#3141

Diff for review: https://github.com/anoma/namada/compare/tiago/balance-change-events..tiago/extra-event-attrs

Working CI: #3178

Checklist before merging to draft

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

[codecov]

Codecov Report

Attention: Patch coverage is 62.28518% with 812 lines in your changes are missing coverage. Please review.

Project coverage is 59.62%. Comparing base (ea843f7) to head (1d05270).
Report is 21 commits behind head on main.

Files	Patch %	Lines
crates/ibc/src/event.rs	46.94%	113 Missing ⚠️
crates/events/src/extend.rs	68.00%	104 Missing ⚠️
...tes/apps/src/lib/node/ledger/shell/testing/node.rs	0.00%	88 Missing ⚠️
...rates/apps/src/lib/node/ledger/shell/governance.rs	14.13%	79 Missing ⚠️
crates/governance/src/event.rs	52.21%	54 Missing ⚠️
crates/events/src/lib.rs	71.59%	50 Missing ⚠️
crates/events/src/extend/dynamic.rs	61.22%	38 Missing ⚠️
crates/sdk/src/rpc.rs	0.00%	32 Missing ⚠️
crates/state/src/wl_state.rs	0.00%	30 Missing ⚠️
...s/apps/src/lib/node/ledger/shell/finalize_block.rs	29.41%	24 Missing ⚠️
... and 26 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3174      +/-   ##
==========================================
+ Coverage   59.41%   59.62%   +0.21%     
==========================================
  Files         298      304       +6     
  Lines       92326    93379    +1053     
==========================================
+ Hits        54853    55681     +828     
- Misses      37473    37698     +225     

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[sug0]

closed in favor of modifying the wasm host fn tx_emit_event to include an extra attribute in the emitted event containing a hash of the commitments of the tx emitting the event