[Issuance flow]: Error Management

[fmarino-ipzs]

Error Management Section should be added with a description of the proper error response codes.

[peppelinux]

I would rescope this issue with the will to have specialized errors for each endpoint/flow

[peppelinux]

This issue should be exploded in five different issues

• [Wallet Solution] Error Management
• [Issuance] Error Management
  • here the callback handlers should be taken in account
• [Presentation] Error Management
• [Pseudonym] Issuance and Presentation Error Management
• [Revocation] request and validation Error Management

[peppelinux]

linked issue about the requirement to extend the issuance flow with the callback about the status of the stored credential (if any)
#137