Presentation within the Issuance: Webview vs embedded http client without js

[peppelinux]

Using Webviews, when the presentation phase is required during the issuance for user authentication, we satisfy the following points:

• More possibility in be compliant with issuances flows implemented by credential issuers not linked to the italian public services
• Compliance with Credential API
• Compliance with the current presentation flow documented within the v0.8.2 of the current specs
• Compliance with the possibility of using User's interaction for selecting the credential id (in between the token endpoint response and the next credential request)

[RosaliaGaleano]

FYI @AntoPaparella

[RosaliaGaleano]

We assume that the webview flow starts after the person identification data presentation step and ends before the PIN request step.
Define whether the user is redirected out of his wallet instance to an interface owned by the issuer or whether the frontend flow remains unchanged from the current one.