Test data split between compiledJava tests and compiledKotlin tests

Basically, this commit splits test data from the from java-txt-kt to two pairs java-txt and kt-txt.
This commit leads to some duplication in test data.
This is temporary: in the platform types branch the test data for LoadJava tests will be changed dramatically, so duplication will go away

compiler/testData/loadJava/compiledJava/notNull/NotNullMethod.java

@@ -0,0 +1,8 @@
+package test;
+
+import org.jetbrains.annotations.NotNull;
+
+public class NotNullMethod {
+    @NotNull
+    public String hi() { return ""; }
+}