chore(evmrpc): expose eth_blobBaseFee on eth RPC surface

[mojtaba-esk]

Describe your changes and provide context

Fixes PLT-161

Ref: PLT-161

Testing performed to validate your change

[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	Mar 17, 2026, 5:19 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.39%. Comparing base (4282c07) to head (ff9c0ae).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3080   +/-   ##
=======================================
  Coverage   58.39%   58.39%           
=======================================
  Files        2088     2088           
  Lines      172108   172067   -41     
=======================================
- Hits       100506   100487   -19     
+ Misses      62656    62635   -21     
+ Partials     8946     8945    -1     

Flag	Coverage Δ
sei-chain-pr	67.47% <100.00%> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
evmrpc/info.go	77.68% <100.00%> (+0.73%)	⬆️

... and 42 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[masih]

The integration_test/evm_module/rpc_io_test/testdata/eth_blobBaseFee/get-current-blobfee.iox needs updating too right?

Separately, we have eip4844.CalcBlobFee that is used in a few places. Checking that you have seen it and there is a good reason not to use it here?

[masih]

Hm this effectively returns a constant. Why all the allocations before it?
Could we not just return the constant here?

[masih]

Could you point me to the settings that confirm this please?

[masih]

Why take args at all?

[masih]

Discussed in 1:1:

• return an explicit method not found with an optional message to say Sei does not support this
• check that documentation is reflective of this

Overall, do the same for all unimplemented EVM API methods first to then put EVM tests in the critical path of CI passing. Then communicate a list of all such methods to the team and discuss which ones we will not support (at least for now) and which ones we want to fix to nurture ecosystem growth.