Evaluator: Support 'field' variable evaluation for top-level properties

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/staticField.kt

@@ -0,0 +1,12 @@
+package staticField
+
+fun main() {
+    x
+}
+
+val x: String = "x"
+    //Breakpoint!
+    get() = "foo" + field
+
+// EXPRESSION: field
+// RESULT: "x": Ljava/lang/String;

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/staticField.out

@@ -0,0 +1,8 @@
+LineBreakpoint created at staticField.kt:9
+Run Java
+Connected to the target VM
+staticField.kt:9
+Compile bytecode for field
+Disconnected from the target VM
+
+Process finished with exit code 0