Prohibit DelegationBy specifier when no primary constructor

Also add codegen test for case when there is primary

compiler/testData/diagnostics/tests/secondaryConstructors/delegationByWithoutPrimary.kt

@@ -0,0 +1,6 @@
+trait A
+class AImpl : A
+
+class B : <!UNSUPPORTED!>A by AImpl()<!> {
+    constructor() {}
+}