[REQ] [kotlin-server] [jaxrs-spec] Top level `@Path` annotations should consist of the most common path in the resource

Is your feature request related to a problem? Please describe.

The kotlin-server jaxrs-spec generator generates all resource classes with the root path @Path("/") as the top level path for that resource. Due to the way JAX-RS is specified, resource classes are matched to URIs by selecting only classes whose top level path matches maximally with the supplied URI. So, if two resource classes with top level annotations @Path("/") and @Path("/v1") are present in the same project, a URI of /v1/foo/bar will only be matched against the latter resource class, even if the former has a method that would match that URI.

Describe the solution you'd like

The Java JAX-RS server interface generator has logic for determining the common path between resource methods in a generated class. It would be helpful to port this functionality to the kotlin-server jax-rs generator.

Describe alternatives you've considered

Using the Java generator is the alternative our team is rocking with at the moment.

Additional context

N/A

Start by comparing the Java JAX-RS template at modules/openapi-generator/src/main/resources/JavaJaxRS/api.mustache, especially its common-path logic, with the Kotlin server jax-rs templates. Identify where Kotlin resource classes receive their top-level @Path and make the generated paths use the common resource path; verify the result with the generator's existing Kotlin JAX-RS tests.