Generate separate server-side OpenAPI endpoints/interfaces

[jdpgrailsdev]

Tell us about the problem you're trying to solve

Currently, the endpoints generated via OpenAPI are all in one class/interface. This prevents the ability to component-ize the implementation of the endpoints and prevents good practices, such as separation of concerns.

Describe the solution you’d like

The OpenAPI generation should be modified to set the useTags configuration option to true:

    configOptions = [
            dateLibrary  : "java8",
            generatePom  : "false",
            interfaceOnly: "true",
            useTags: "true"
    ]

for the server API generation. Note that the generator will still generate the single API, so this should not require any changes to the implementation.

Acceptance Criteria

• Separate interfaces are generated for each "domain" in the server API
• No modification required for existing implementation
• All tests pass/API continues to function as expected