Addition of the remaining methods which are in the Wallet Api

[aiinkiestism]

Description
There's a few methods that are in the Wallet Api but not in this library.

I'm currently writing Dapp codes with React and on my way to refactor Wallet connection logic with this library, replacing Wallet Api with this library.
For now everything seems to be fine except above point. e.g. addCIS2Tokens

[bisgardo]

Hi @aiinkiestism, thanks for filing this issue.

The addCIS2Tokens and requestIdProof methods are not yet supported in the mobile wallets.

I think we should definitely add the methods to BrowserWalletConnector. If added to the WalletConector interface, the methods would have to throw "not implement" exceptions in WalletConnect. I think that's also reasonable, but will check with the team. We probably need a way for the dapp to probe whether a connector supports a given method.

For now, you can still access the browser wallet API directly via the client field in BrowserWalletConnector.

[bisgardo]

Internal task: https://concordium.atlassian.net/browse/CBW-961