Fix serialization of parameters and parsing of result in requestVerifiablePresentation

[orhoj]

Purpose

Fix an issue with the request parameters and parsing of the result of the request in requestVerifiablePresentation. We have to wrap the parameters and the result to ensure that WalletConnect does not attempt to do any parsing on the JSON as it will fail on bigints.

Changes

• Wrap request parameters and update result type to a wrapper as well (this matches what is now done in the CryptoX wallet).

Checklist

• [x] My code follows the style of this project.
• [x] The code compiles without warnings.
• [x] I have performed a self-review of the changes.
• [x] I have documented my code, in particular the intent of the hard-to-understand areas.
• [x] (If necessary) I have updated the CHANGELOG.

[orhoj]

Is it correctly understood that the problem only affects credentialStatements, not challenge? Because as challenge is already a string that should be unaffected. If there are decoding errors of that I suspect that the problem is on the wallet side.

Yes, the problem only affects credentialStatements.