Support ethers

[elliotBraem]

In order to have full parity with NearSocial/viewer, we need to introduce EthersProvider for ethers.js support.

This can reference/reuse the useWeb3 hook from bos-workspace/gateway.

Add documentation for how to add chain support to this list, and how to utilize Ethers js in your own widget (or reference existing documentation)

[elliotBraem]

@bb-face You'll be able to validate a successful integration by viewing any of the EVM widgets through the web component

https://near.social/hackerhouse.near/widget/EVMComponents

For example, notice how "Connect with Web3" button doesn't work here:
https://psalomobos.near.page/zavodil.near/widget/Lido

but does work here:

https://near.social/zavodil.near/widget/Lido

Maybe there should be a test included in this ticket that validates a web3 login button works