FIR: support lateinit properties

compiler/testData/fir/rawBuilder/declarations/simpleClass.kt

@@ -15,5 +15,5 @@ class SomeClass : SomeInterface {
         get() = true
         set(value) {}
 
-    var fau: Double
+    lateinit var fau: Double
 }

compiler/testData/fir/rawBuilder/declarations/simpleClass.txt

@@ -20,7 +20,7 @@ FILE: simpleClass.kt
             public? set(value: Boolean): <implicit> {
             }
 
-        public? final? property fau(var): Double
+        public? final? lateinit property fau(var): Double
             public? get(): Double
             public? set(value: Double): R|kotlin/Unit|