JET-6 Perform checks for primary and secondary constructors (In progress): class having a stateful property must have a constructor

idea/testData/checker/PrimaryConstructors.jet

@@ -0,0 +1,14 @@
+class <error>X</error> {
+  val x : Int
+}
+
+class Y() {
+  val x : Int
+}
+
+class Y1 {
+  val x : Int get() = 1
+}
+
+class Z : Y<error>()</error> {
+}