[LL FIR] FileStructure: add tests for re-analyzable elements without names

^KT-60132
^KT-59687

analysis/low-level-api-fir/testdata/fileStructure/withoutName.kt

@@ -0,0 +1,29 @@
+fun (a: Int = 1): String = "str"/* NonReanalyzableNonClassDeclarationStructureElement */
+
+fun () {/* NonReanalyzableNonClassDeclarationStructureElement */
+
+}
+
+val : Int = 4/* NonReanalyzableNonClassDeclarationStructureElement */
+
+var : Int/* NonReanalyzableNonClassDeclarationStructureElement */
+    get() = 4
+    set(value) {
+
+    }
+
+class A {/* NonReanalyzableClassDeclarationStructureElement */
+    fun (a: Int = 1): String = "str"/* NonReanalyzableNonClassDeclarationStructureElement */
+
+    fun () {/* NonReanalyzableNonClassDeclarationStructureElement */
+
+    }
+
+    val : Int = 4/* NonReanalyzableNonClassDeclarationStructureElement */
+
+    var : Boolean/* NonReanalyzableNonClassDeclarationStructureElement */
+        get() = true
+        set(value) {
+
+        }
+}