Migrate to viem

[typedarray]

Migrates to viem!

• Ponder projects must now use Node 18 or a fetch polyfill (see viem docs).
• Many of the values in event.block, event.transaction, and event.log are now bigint instead of ethers.BigNumber.
• context.contracts objects will also have slightly different types.
• Projects should remove ethers as a dependency, and will need to add dev dependencies on viem, abitype, and typescript.

Fixes #5, #74, #43

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[roninjin10]

Alternatively node --experimental-fetch

[typedarray]

Oh, interesting. I suppose users could change their package.json like this (just tested, works on Node 16). Pretty ugly though!

// before
{
  "scripts": {
    "dev": "ponder dev",
  },
}

// after
{
  "scripts": {
    "dev": "node --experimental-fetch node_modules/@ponder/core/dist/bin/ponder.js dev",
  },
}