[Commonizer] Enable Optimistic Number Commonization by default

Initially it was restricted to work with type aliases only KT-48455
see test `test property with aliased number return type`

This limitation should be lifted now in order to fix KT-48568

^KT-48568 Verification Pending

native/commonizer/testData/callableMemberCommonization/returnTypes/commonized/common/package_root.kt

@@ -27,6 +27,12 @@ expect fun function5(): Planet
 expect fun function6(): Planet
 expect fun function7(): C
 
+// Optimistic Number Commonization: KT-48455, KT-48568
+expect val propertyWithMismatchedType1: Int
+expect val propertyWithMismatchedType2: Short
+expect fun functionWithMismatchedType1(): Int
+expect fun functionWithMismatchedType2(): Short
+
 expect class Box<T>(value: T) {
     val value: T
 }