What is the purspose of `modules` in Maven detector?

[bakhtos]

When implementing #49 , I tried to refactor all the code accordingly, but then functions extract_modules() and check_nested_modules() are unclear:

• First, extract_modules() gets all the entries in the <modules> tag of the POM
• Then, they are saved to modules_tuples together with the name of the file they are extracted from, which is always goind to be pom.xml
• Then check_nested_modules() attempts to find all the "components" that appear in some modules list, however, as noted before, the component is always pom.xml which is not goind to appear in the modules list
• All such identified components are saved into microservices_set, however, this set is not used to update the microservices

So it looks like it is either unfinished implementation or dead code.