feat(data): JSON-RPC methods

[mds1]

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• List of all standard execution-related methods and their interfaces, along with chain-specific methods. For mainnet we can start with https://ethereum.org/en/developers/docs/apis/json-rpc/.
• Consensus layer RPCs can be ignored for now since the site focus is execution level

This is dependent on #33 as some nodes have non-standard RPC methods that others nodes (even for the same chain) don't implement, so #33 should be completed first that

[leovct]

I can work on this once #50 is merged :)

[mds1]

Thanks! Hoping to review #50 in the next day or two

[mds1]

Closing this issue as part of the move to automated data collection in #62