Created module idea-test-framework and moved classes needed for idea tests there

Moved tests for completion and their test data into module idea-completion

idea/idea-completion/testData/basic/custom/NamedArgumentsJavaSrc/JavaClass.java

@@ -0,0 +1,5 @@
+package lib;
+
+public class JavaClass {
+    public void foo(int paramName) {}
+}