Unit Test Tooling: Support Go to Test/Create Test actions for top-level declarations

#KT-10133 Fixed

idea/testData/navigation/gotoTestOrCode/fromKotlinFileToTest.main.kt

@@ -0,0 +1,19 @@
+// CONFIGURE_LIBRARY: JUnit@lib/junit-4.12.jar
+// REF: (<root>).FooUtilsTest
+// REF: FooUtilsTest2
+@file:JvmName("FooUtils")
+import junit.framework.TestCase
+
+class Foo
+
+fun <caret>foo() {
+
+}
+
+val x = 1
+
+@JvmField val y = 2
+
+class FooUtilsTest : TestCase() {
+
+}