This also fixes the logic for multiple ResponseDTOs that were being sent when the service level response was a Flux. Now we only return a single array inside a Mono ResponseDTO object.
We are moving to a multi-module structure so that different parts of the codebase can be exposed to the public while others can remain private. Using pf4j for plugin framework.
Also adding a build script `build.sh` which compiles the code and creates the `dist` folder for distribution purposes. Now we can build the code via
```
$ ./build.sh -DskipTests
```
