There's no need to package `*.java` files into the runtime jar

[raylras]

• Including *.java files in the runtime jar makes it larger, but they are unnecessary during runtime.
• It causes confusion when browsing the LSP4J source code in IDEA, as it results in duplicate classes.

Solution:

• Simply remove the contents of org.eclipse.lsp4j/build.gradle lines 27-29:

  
  @@ -24,10 +24,6 @@
  testImplementation "com.tngtech.archunit:archunit:$versions.archunit"
  }

-jar {

• from sourceSets.main.allJava -}

• jar.bnd ( 'Import-Package': "com.google.gson.;version=\"$versions.gson\"," )

[jonahgraham]

Great idea. Can you provide a PR please? We need to also check that the various sources jars still have all the sources after making the change.

[jonahgraham]

Fixed by #764