Generate Java API Client for Intelligence Service's OpenAPI Specifications

[FelixTJDietrich]

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

We want to ensure that the application server and intelligence service are able to communicate with each other using the OpenAPI specifications without a lot of manual overhead.

Describe the solution you'd like

• Similarly to the application server, store the OpenAPI specifications in the intelligence service directory.
• Generate the Java client for the application server using the OpenAPI specifications.
• Add a root level package.json script to generate the Java client for the intelligence service.
• Create a github action workflow if necessary that fails if the Java client is not up-to-date with the OpenAPI specifications.

Describe alternatives you've considered

• Manually keeping the Java client up-to-date with the OpenAPI specifications.
• Using gRPC instead of OpenAPI specifications, but I think OpenAPI specifications are more widely used and understood.