chore(evmrpc): explicit unsupported rpcs

[mojtaba-esk]

Describe your changes and provide context

Expose several unimplemented Ethereum JSON-RPC methods on Sei so callers get -32000 and a clear error.message instead of -32601 (method not found)—same idea as eth_blobBaseFee.

Changes
debug_getRawBlock / Header / Receipts / Transaction, eth_newPendingTransactionFilter, eth_syncing → registered + ErrEVMNotSupported (evmrpc/rpc_unsupported.go).
eth_blobBaseFee → same error type as above.
Tests: unit + not-supported.iox fixtures; docs: docs/evm_jsonrpc_unsupported.md, evmrpc/AGENTS.md, README/analysis tables.

Testing performed to validate your change

go test ./evmrpc/...
evm_rpc_tests.sh / RPC IO suite (157 fixtures)

Related issues: PLT-159, PLT-160, PLT-167

[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 19, 2026, 4:12 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.55%. Comparing base (7a2287a) to head (ededa17).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3086      +/-   ##
==========================================
- Coverage   58.70%   58.55%   -0.16%     
==========================================
  Files        2093     2091       -2     
  Lines      172949   171912    -1037     
==========================================
- Hits       101538   100662     -876     
+ Misses      62426    62305     -121     
+ Partials     8985     8945      -40     

Flag	Coverage Δ
sei-chain-pr	67.81% <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/filter.go	70.51% <100.00%> (+0.14%)	⬆️
evmrpc/info.go	77.68% <100.00%> (ø)
evmrpc/rpc_unsupported.go	100.00% <100.00%> (ø)
evmrpc/tracers.go	67.98% <100.00%> (+2.41%)	⬆️

... and 82 files with indirect coverage changes

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[codebycarson]

Looks good in theory on my end, I'll let someone on protocol eng give the stamp of approval though