single-service Implementation

[lahirujayathilake]

Wrapped api-service, resource-service, and secret-service into a single service.

• Required annotations were added to Entities, Services, Configurations, and Repositories
• New module was added to hold the single-service

[DImuthuUpe]

Looks great @lahirujayathilake. I have added a few comments, most to understand new annotations. I prefer to change the module name though. Can you check if you can integrate the controller and agent into this as well?

[DImuthuUpe]

Please add distribution building functionality into the pom. Here is an example https://github.com/apache/airavata-mft/blob/master/services/resource-service/server/pom.xml#L92

[DImuthuUpe]

Thanks @lahirujayathilake. Please address the review comments added above