Java support

[nbirillo]

Support search entities in Java files from the project and the libraries. We can use special JavaDescriptors to search the entities (only for Reflekt part, since for SmartReflekt we have to adapt all Kotlin-specific properties to Java)

In this case, we also can support the usage of the Reflekt queries in Java files, but we can not replace IR since we don't have IR in Java. To keep our approach multiplatform, we can use ReflektImpl approach -- generate ReflektImpl implementation not only for the libraries but and for the current project (only for Java queries)