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\",*"
 )

[Jonah Graham]

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.

[Jonah Graham]

Fixed by #764