feat: implement w3c credential issuance by connection Id (BE)

[bhavanakarwade]

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• [x] Implement w3c credential issuance by connection Id. (Support multi select connections)

[sayali-chavan96]

Pending Todos:

Backend

• [ ] When issuing W3C credentials with a connection ID, validation is required. If the provided protocol version is invalid ("protocolVersion": "v1"), the system should return a '400 Bad Request' status code with the message:"Provided protocol version is not supported"

[bhavanakarwade]

As per discussion with @GHkrishna, He has upcoming task for supporting AnonCreds. In that task, he will modify the payload body according to the credential type. Therefore, he will handle the protocol version validation as part of that task