[Test] Extract CLI tests for plugins into separate directory

compiler/testData/cli/jvm/plugins/pluginSimple.kt

@@ -0,0 +1,8 @@
+import android.view.*
+import android.app.*
+import android.widget.*
+import kotlinx.android.synthetic.main.layout.*
+
+class MyActivity : Activity() {
+    init { textView.setText("Some text") }
+}