Enable support for Filecoin.EthNewFilter V2

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Enabled support for Filecoin.EthNewFilter V2 as Safe and Finalized are not yet implemented in lotus.

Reference issue to close (if applicable)

Closes #6304

Other information and links

• Tracking Issue in forest: Add support for more block tags (e.g. finalized, safe) in Filecoin.EthGetLogs #6411

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• New Features
  • Filecoin.EthNewFilter is now enabled and reachable via API v2 endpoints. This expands availability to v2 clients while preserving existing parameters, return values, and runtime behavior. No public API signatures or observable method behavior were changed; this update only broadens which endpoints can access the method.

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Walkthrough

Enable Filecoin.EthNewFilter for API v2 routing by changing its API_PATHS from ApiPaths::all() to ApiPaths::all_with_v2() and add a CHANGELOG entry documenting the change.

Changes

Cohort / File(s)	Summary
Changelog CHANGELOG.md	Add entry noting Filecoin.EthNewFilter enabled for API v2 routing.
RPC Method Configuration src/rpc/methods/eth.rs	Update EthNewFilter const API_PATHS from ApiPaths::all() to ApiPaths::all_with_v2() to include v2 routes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: enable V2 API support for basic Eth and Filecoin RPC methods #6171 — Same ApiPaths::all() → ApiPaths::all_with_v2() change for EthNewFilter.
• Enable support for Filecoin.EthGetBlockTransactionCountByHash V2 #6466 — Similar routing change for Eth RPC methods to include v2.
• Enable support for Filecoin.EthGetLogs V2 #6405 — Same code-level API_PATHS switch in src/rpc/methods/eth.rs for Eth methods.

Suggested reviewers

• LesnyRumcajs
• akaladarshi

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: enabling Filecoin.EthNewFilter support for API v2.
Linked Issues check	✅ Passed	The PR successfully implements support for Filecoin.EthNewFilter V2 by updating API_PATHS to include v2, directly addressing the objective from linked issue #6304.
Out of Scope Changes check	✅ Passed	All changes are in-scope: CHANGELOG.md entry documents the feature addition and src/rpc/methods/eth.rs enables EthNewFilter for v2 as required.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch shashank/enable-eth-new-filter-v2

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.38%. Comparing base (99d1f28) to head (cfa28ae).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/rpc/methods/eth.rs	69.89% <ø> (ø)

... and 2 files with indirect coverage changes

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[hanabi1224]

I believe this PR will fail the openrpc test enabled by #6523. Let's hold until the other one is merged.

[hanabi1224]

Please move the changelog entry to the new unreleased section