[FIR2IR] Add fields to Fir2IrLazyClass.declarations for Java classes

^KT-61362 Fixed

compiler/testData/ir/irText/firProblems/MissingFieldInJavaClass.kt

@@ -0,0 +1,41 @@
+// FIR_IDENTICAL
+// TARGET_BACKEND: JVM
+// ISSUE: KT-61362
+// DUMP_EXTERNAL_CLASS: J
+// DUMP_EXTERNAL_CLASS: X
+// DUMP_EXTERNAL_CLASS: J1
+// DUMP_EXTERNAL_CLASS: X1
+
+// FILE: J.java
+
+class J {
+    public int f = 0;
+    public static int s = 0;
+
+    public int f2 = 0;
+    public static int s2 = 0;
+}
+
+// FILE: X.java
+
+class X extends J {
+    public int f2 = 1;
+    public static int s2 = 1;
+}
+
+// FILE: J1.java
+
+class J1<T> {
+    public T f = null;
+    public static T s = null;
+
+    public T f2 = null;
+    public static T s2 = null;
+}
+
+// FILE: X1.java
+
+class X1<T> extends J1<String> {
+    public String f2 = "s1";
+    public static String s2 = "s2";
+}