refactor: implement `validate schema url attributes` functionality

[bhavanakarwade]

What?

• Implemented validate schema URL attributes functionality during issuance by connection ID.
• Implemented validate schema URL attributes functionality during out-of-band issuance.
• Implemented validate schema URL attributes functionality during out-of-band issuance using email.
• Handled partial, success, and failure responses for issuance by connection ID.

Why?

• To make sure the issued attributes match the defined schema, ensuring data accuracy.
• To provide clear feedback on the status of each issuance attempt, improving error handling and user experience