Psi2ir: support generic properties in class delegation

Since property accessor descriptors (unlike corresponding IR elements)
do not have type parameters, we need to take them from the corresponding
property to ensure the correct IR for delegated property accessors.

compiler/testData/ir/irText/classes/delegatedGenericImplementation.kt

@@ -0,0 +1,9 @@
+interface IBase<A> {
+    fun <B> foo(a: A, b: B)
+    val <C> C.id: Map<A, C>?
+    var <D> List<D>.x: D?
+}
+
+class Test1<E>(i: IBase<E>) : IBase<E> by i
+
+class Test2(var j: IBase<String>) : IBase<String> by j