Add eth_feeHistory RPC endpoint

[mike6649]

What was wrong?

Post-london RPC endpoint eth_feeHistory is not currently supported. This PR adds support for it with fee_history in the eth module.
Related to Issue #2038

How was it fixed?

Following the eth1.0-specs, fee_history function was added to the eth module.

Todo:

• Add support to async eth module
• Testing
• Add entry to the release notes

Cute Animal Picture

[mike6649]

Hi! Please let me know if there is any feedback to the implementation so far. I'm just roughly following the implementations of similar RPC methods, but I'm not sure whether the tests are written properly. Thanks all!

[kclowes]

Thanks for the PR @mike6649! This looks like what we were going for! I added some nitpicky comments around the use of apply_list_to_array_formatter vs. apply_formatter_to_array that I'm curious to get your feedback on, but looks good other than that!

Also if you don't mind adding a newsfragment, that would be helpful. If you don't get to it, one of the maintainers can before merge. Thanks again!

[mike6649]

Hi @kclowes , I made the suggested changes above and added a newsfragment. Let me know if there is anything else! 👍

[kclowes]

Looks good to me! Thanks @mike6649! I'll get it merged soon!