chore: cleanup and fixes

[TimoGlastra]

Fixes #34
Fixes #48

It also does some general cleanup, and removes the getOpenId4vp request payload callback. It seems that every request should have an unique url and thus the request can be linked to the response before this library is invoked (we don't have to look at the header). This might change based on outcome of openid/OpenID4VP#441

[changeset-bot]

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Latest commit: 72e6eac

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[TimoGlastra]

Not adding changesets as it's all for pre-released functionality

[TimoGlastra]

@auer-martin want to wrap up the integration in Credo so merging. Feel free to leave any comments still, I'll address them in a follow up PR before we make a stable release