Audit TODOs in the codebase

[sug0]

Describe your changes

Closes #3179

Full list of TODOs: https://p.sicp.me/d2PNB
Unaccounted for TODOs: https://p.sicp.me/mpxUF

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

v0.36.1

Checklist before merging to draft

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

[codecov]

Codecov Report

Attention: Patch coverage is 52.58621% with 55 lines in your changes are missing coverage. Please review.

Project coverage is 53.78%. Comparing base (c7d79f4) to head (5817d5f).
Report is 3 commits behind head on main.

Files	Patch %	Lines
crates/apps_lib/src/client/rpc.rs	0.00%	9 Missing ⚠️
crates/node/src/shell/mod.rs	33.33%	8 Missing ⚠️
crates/node/src/broadcaster.rs	0.00%	7 Missing ⚠️
crates/apps_lib/src/cli/api.rs	0.00%	5 Missing ⚠️
crates/sdk/src/queries/mod.rs	0.00%	4 Missing ⚠️
crates/core/src/key/secp256k1.rs	85.71%	3 Missing ⚠️
...rc/protocol/transactions/ethereum_events/events.rs	70.00%	3 Missing ⚠️
...ledger/native_vp/ethereum_bridge/bridge_pool_vp.rs	0.00%	3 Missing ⚠️
crates/node/src/shell/prepare_proposal.rs	0.00%	3 Missing ⚠️
..._bridge/src/protocol/validation/ethereum_events.rs	0.00%	2 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3234      +/-   ##
==========================================
- Coverage   53.79%   53.78%   -0.01%     
==========================================
  Files         314      314              
  Lines      105784   105724      -60     
==========================================
- Hits        56903    56868      -35     
+ Misses      48881    48856      -25     

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[batconjurer]

couple of small things

[sug0]

@tzemanovic @brentstone should I leave the PoS TODOs untouched?

[sug0]

rebased on v0.36.1