Add rate limiting options for @wagmi/cli block explorer plugins

[tyko0x]

Block explorers like etherscan often have strict rate limiting: https://etherscan.io/apis. For example, under the free etherscan plan, if you are fetching more than 5 ABIs, then the plugins errors out since the rate limit is 5 calls per second.

I suggest adding some rate limiting options - such as limit and interval options.

[kasparkallas]

Yep, Etherscan is very script about the calls. Even paid version is just 10 requests per second.

Workaround is to put this somewhere in the etherscan.js in node_modules for @wagmi/cli & ../dist/esm/plugins:

const json = await globalThis
    .fetch(buildUrl({ ...options, action: 'getsourcecode' }))
    .then((res) => res.json())
    .then((json) => new Promise((resolve) => setTimeout(() => resolve(json), 1000))); // This...