Support for Arbitrum Mainnet and Sepolia

[moisesja]

I'm developing a prototype of a Web3Auth integration using Arbitrum as our L2. Apparently it is not supported.
When setting my chainConfig I get the following error:

Invalid network, net_version is: 11155111
at getEthProviderError (http://localhost:8080/js/chunk-vendors.js:39652:10)
at Object.chainDisconnected (http://localhost:8080/js/chunk-vendors.js:39797:12)
at EthereumPrivateKeyProvider.lookupNetwork (http://localhost:8080/js/chunk-vendors.js:43125:114)
at async EthereumPrivateKeyProvider.setupProvider (http://localhost:8080/js/chunk-vendors.js:43076:5)
at async AuthAdapter.connectWithProvider (http://localhost:8080/js/chunk-vendors.js:38464:7)
at async AuthAdapter.connect (http://localhost:8080/js/chunk-vendors.js:38321:7)
at async Web3Auth.connectTo (http://localhost:8080/js/chunk-vendors.js:45066:22)
at async LoginModal. (http://localhost:8080/js/chunk-vendors.js:44794:9)

While inspecting the error stack I see that Web3Auth/web3auth-web/packages/base/src/chain/config.ts does not have any support for Arbitrum.

The capabilities of Web3Auth are great but without support for Arbitrum this cannot be adopted.