[feature] - Persist web3 connection even when on unsupported chain

[fatherGoose1]

What problem does this new feature solve?

Web3Modal drops the connection when the user switches off of a supported chain. This removes the ability for the dApp to use dApp integrations that offer cross-chain functionality, such as:

• Squid Router
• Gasbot.xyz
• Li.Fi
• Stargate

Dapps using Web3Modal cannot use such dApp integrations because their widgets rely on chain switching for the user to initiate bridge transactions.

Similar to #1891 which disables the popup message when a user switches off of a supported chain. On top of disabling the popup, the web3 connection must remain open to allow the user to sign messages on other chains. This functionality is already possible in RainbowKit and Web3-React, for example.

Describe the solution you'd like

Do not drop the wallet connection even when the user has switched off of the supported chains.

[linear]

W3M-164 [feature] - Persist web3 connection even when on unsupported chain