Prohibit secondary constructors in traits

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

@@ -0,0 +1,3 @@
+trait A {
+    <!CONSTRUCTOR_IN_TRAIT!>constructor() {}<!>
+}

compiler/testData/diagnostics/tests/secondaryConstructors/constructorInTrait.txt

@@ -0,0 +1,7 @@
+package
+
+internal trait A {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}