Viem and ethers6 compatibility in the Lit SDK

[a1ttech]

Overview

The idea is that whenever a new Ethers provider or signer is accepted, the SDK starts by checking it's type. If it's an ethers provider or signer, the SDK should do nothing. If it's a Viem provider or signer, the Viem adaptor code (linked here) should be run first so that the correct ethers-compatible provider or signer can be passed into the Lit JS SDK function that needs it.

Motivation

This functionality will make the JS SDK "Viem compatible" and makes it really easy to use the Lit JS SDK on any dApp that is using Viem.