rpc api rate limit

[ilovers]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (f1ce92c) 36.53% compared to head (21dfcac) 36.50%.

:exclamation: Current head 21dfcac differs from pull request most recent head 0161331. Consider uploading reports for the commit 0161331 to get more accurate results

Files	Patch %	Lines
app/rpc/namespaces/eth/api.go	0.00%	35 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #3273 +/- ## ========================================== - Coverage 36.53% 36.50% -0.03% ========================================== Files 446 446 Lines 46869 46904 +35 ========================================== Hits 17124 17124 - Misses 28472 28507 +35 Partials 1273 1273 ```

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