More fine-grained error messaging for Dev mode

[Oran-Dan]

Description

blocked by this issue in the oid4vc repository:
impierce/openid4vc#78

Althoug end-users might not need more details, in dev mode we want to give devs more feedback.
Errors in specific:

• Failed to parse QR code: this can be split up into 2 errors, either the QR code has an invalid syntax according to the OID4VC protocol. We could even link the Specs here. Or, the QR code leads to invalid/unusable content, the error should then say as such.
• Operation timed out: This can be due to a break in one of the many steps of the OID4VC flow. After the above mentioned issue has been closed, we should display more fine-grained error messages.
• Infinite loading occurring when credential offer hosted behind firewall should stop and display an error, see issue: - Infinite loading screen when scanning Credential Offer hosted behind Firewall #337

Motivation

add to DX

Resources

No response

To-do List

• Tackle error messaging as listed in Description