Refactor debugger tests

1. Move tests to their own module
2. Avoid sharing the 'tinyApp' project between tests
3. Clean up option directive handling

idea/jvm-debugger/jvm-debugger-test/testData/stepping/stepInto/samAdapter.kt

@@ -1,3 +1,4 @@
+// FILE: samAdapter.kt
 package samAdapter
 
 fun main(args: Array<String>) {
@@ -10,4 +11,22 @@ fun runReadAction(action: () -> Int): Int {
     return forTests.MyJavaClass.runReadAction<Int>(action)
 }
 
-// STEP_INTO: 8
+// STEP_INTO: 8
+
+// FILE: forTests/MyJavaClass.java
+package forTests;
+
+import org.jetbrains.annotations.NotNull;
+
+public class MyJavaClass {
+    public static <T> T runReadAction(@NotNull Computable<T> computation) {
+        return computation.compute();
+    }
+}
+
+// FILE: forTests/Computable.java
+package forTests;
+
+public interface Computable <T> {
+    T compute();
+}