Cache typed txs for RPC reads

[codchen]

Describe your changes and provide context

Some RPC endpoints (e.g. eth_getLogs) spend a lot of CPU cycles on decoding transactions. This PR caches the decoded transaction in memory (up to a configurable limit) during the write path so that RPC requests for recent blocks don't need to spend on decoding. This cache doesn't participate in consensus in any way.

(cpu usage & breakdown before & after the change, under 200 eth_getLogs requests per second)
before:

after:

Testing performed to validate your change

^
unit tests

[codecov]

Codecov Report

❌ Patch coverage is 91.42857% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.60%. Comparing base (e37ef58) to head (bb82fc9).
⚠️ Report is 695 commits behind head on main.

Files with missing lines	Patch %	Lines
evmrpc/utils.go	72.72%	1 Missing and 2 partials ⚠️

❗ There is a different number of reports uploaded between BASE (e37ef58) and HEAD (bb82fc9). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e37ef58)	HEAD (bb82fc9)
sei-tendermint	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2464       +/-   ##
===========================================
- Coverage   53.98%   39.60%   -14.39%     
===========================================
  Files        1004     1582      +578     
  Lines       97098   161670    +64572     
===========================================
+ Hits        52422    64034    +11612     
- Misses      40864    92782    +51918     
- Partials     3812     4854     +1042     

Flag	Coverage Δ
sei-chain	27.09% <85.29%> (?)
sei-cosmos	51.95% <ø> (ø)
sei-tendermint	?
sei-wasmd	51.40% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	77.27% <100.00%> (-1.45%)	⬇️
evmrpc/config.go	84.48% <100.00%> (ø)
x/evm/keeper/keeper.go	58.29% <100.00%> (ø)
evmrpc/utils.go	76.61% <72.72%> (ø)

... and 1021 files with indirect coverage changes

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Oct 15, 2025, 3:23 AM

[github-actions]

We truly appreciate your contribution and the time you’ve invested in this PR.
Before we can merge it, we’d love your help addressing the remaining feedback or sharing your perspective.
If we don’t hear back within 2 day(s), this PR will close automatically — but don’t worry, you can reopen it anytime when you’re ready to continue.

[github-actions]

We truly appreciate your contribution and the time you’ve invested in this PR.
Before we can merge it, we’d love your help addressing the remaining feedback or sharing your perspective.
If we don’t hear back within 2 day(s), this PR will close automatically — but don’t worry, you can reopen it anytime when you’re ready to continue.