MicroProfile LS manages Java and properties files. For LSP TextDocumentService layer, it's pretty well separated, we have

• ApplicationPropertiesTextDocumentService.java for properties files. We should be renamed to PropertiesTextDocumentService (because it manages all properties files like microprofile-config.properties, aplication.properties and application.yaml).

• JavaTextDocumentService.java for java files
  The LSP TextDocumentService should called a language service. We have that for ApplicationPropertiesTextDocumentService (it consumes MicroProfileLanguageService but not for java).

The idea of this issue is :

move MicroProfileLanguageService to the org.eclipse.lsp4mp.services.properties package. Rename MicroProfileLanguageService to MicroProfilePropertiesLanguageService

create MicroProfileJavaLanguageService which will be consumed by JavaTextDocumentService.java