[PAY-3473] Add packages/eth scaffolding

[raymondjacobson]

Description

Add packages/eth to replace the eth contracts interactions in libs for a cleaner, nicer SDK using viem instead of web3

• Writes are not implemented yet. We will need those for protocol dashboard
• Some examples of events are implemented, but some may still be missing. Most reads should be functional. See rj-remove-libs for usage in SDK

Usage looks like this

import { createPublicClient, http } from 'viem'
import { mainnet } from 'viem/chains'
import { ServiceTypeManager } from '@audius/eth'

const client = createPublicClient({
  chain: mainnet,
  transport: http(/* rpc endpoint */)
})

const contract = new ServiceTypeManager(client, {
  address: /* address */
})

await contract.getCurrentVersion({
  serviceType: utfToHex('discovery-node')
})

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide repro instructions & any configuration.

npm run build

and in the branch rj-remove-libs

npm run sdk:config -w packages/sdk

which generates config using this library instead of the old ethweb3manager

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Latest commit: d4de75275efe279bf5c269927d056168b94ab93d

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