Implement operation: unmark ready for notarization request

Related to #1 (closed), #12 (closed)

• Update docu for transition "unmark ready"

• The defined functional operation (see requirements)

• Enforces pre-conditions (these pre-conditions are a source of well-known errors)

• Exposes metrics

• Has a correct OpenAPI specification (that defines well-known errors)

• Has tests for:

  • happy path(s)
  • well-known errors Specific Requirements:

• CMP.NA.00022 Creation of Notarization Requests
• CMP.NA.00026 Storing/Update/Deletion of Requests

General Requirements:

• CMP.NA.00013 Notarization Request Endpoint
• CMP.NA.00015 Internal Request Management Endpoint