Feature request: typed return from toSignature

[SebastienGllmt]

Right now, you can format an ABI item into a signature using formatAbiItem from abitype. However, the format returned isn't the format required for events:

// this returns the string below which is almost, but not quite what we want
// event Transfer(address indexed from, address indexed to, uint256 value)
formatAbiItem({
  anonymous: false,
  inputs: [
    {
      indexed: true,
      name: 'from',
      type: 'address',
    },
    {
      indexed: true,
      name: 'to',
      type: 'address',
    },
    {
      indexed: false,
      name: 'value',
      type: 'uint256',
    },
  ],
  name: 'Transfer',
  type: 'event',
})

There exists another function that does give us the output we want: toEventSignature. However, its return type is just string instead of being a constant string like formatAbiItem

[SebastienGllmt]

I created a PR in abitype to add the missing functionality required to make this work: wevm/abitype#255 with the corresponding viem PR here: #2928