FIR deserializer: support properties

compiler/fir/resolve/testData/loadCompiledKotlin/class/NamedObjectInNamedObject.txt

@@ -4,6 +4,9 @@ public final object Outer : R|kotlin/Any| {
     public final object Obj : R|kotlin/Any| {
         public final fun f(): R|kotlin/String|
 
+        public final val v: R|kotlin/String|
+            public get(): R|kotlin/String|
+
         private constructor(): R|test/Outer.Obj|
 
     }