j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/methodCallExpression/genericMethod.kt

@@ -0,0 +1,13 @@
+package demo
+
+class Map {
+    fun <K, V> put(k: K, v: V) {
+    }
+}
+
+class U {
+    fun test() {
+        val m = Map()
+        m.put<String, Int>("10", 10)
+    }
+}