[LL FIR] add test data for data class from library

^KT-65763

analysis/low-level-api-fir/testData/getOrBuildFirBinary/dataClass.kt

@@ -0,0 +1,14 @@
+// DECLARATION_TYPE: org.jetbrains.kotlin.psi.KtClass
+// MAIN_FILE_NAME: MyDependency
+
+package one
+
+class A
+class B
+class C
+class D
+
+data class MyDependency(val b: B, var d: D) {
+    val a: A get() = A()
+    val c: C get() = C()
+}