feat: Implement generic API for schema creation (Single endpoint)

[tipusinghaw]

Acceptance Criteria:

• [x] Users should be able to successfully create schemas using a single API endpoint, with the option to select either the Indy or W3C ledger

[sayali-chavan96]

Pending Todos:

Backend

• [ ] When try to create a schema by passing an empty attribute array, there is a need for validation,the system should return a '400, Bad Request ' status code with the message:"schemaPayload.attributes must contain at least 1 elements"

[GHkrishna]

Pending Todos:

Backend

* [ ]  When try to create a schema by passing an empty attribute array, there is a need for validation,the system should return a '400, Bad Request ' status code with the message:"schemaPayload.attributes must contain at least 1 elements"

@sayali-chavan96 In this is resolved, can you please close the issue?