deprecate Iterable#unzip in favor of stdlib method

From what I can tell the other unzip methods have no equivalent in the
stdlib.

NonEmptyList is of course covered by the Iterable#unzip, but still has
a use-case because of returning a pair of NonEmptyLists rather than
a pair of regular Lists.

arrow-libs/core/arrow-core/src/commonMain/kotlin/arrow/core/Iterable.kt

@@ -844,6 +844,10 @@ public fun <A> Iterable<A>.salign(
  * <!--- KNIT example-iterable-11.kt -->
  * <!--- TEST lines.isEmpty() -->
  */
+@Deprecated(
+  "Unzip is being deprecated in favor of the standard library version.\n$NicheAPI",
+  ReplaceWith("unzip()", "kotlin.collections.unzip")
+)
 public fun <A, B> Iterable<Pair<A, B>>.unzip(): Pair<List<A>, List<B>> =
   fold(emptyList<A>() to emptyList()) { (l, r), x ->
     l + x.first to r + x.second
@@ -867,6 +871,10 @@ public fun <A, B> Iterable<Pair<A, B>>.unzip(): Pair<List<A>, List<B>> =
  * <!--- KNIT example-iterable-12.kt -->
  * <!--- TEST lines.isEmpty() -->
  */
+@Deprecated(
+  "Unzip is being deprecated in favor of the standard library version.\n$NicheAPI",
+  ReplaceWith("map(fc).unzip()", "kotlin.collections.unzip")
+)
 public inline fun <A, B, C> Iterable<C>.unzip(fc: (C) -> Pair<A, B>): Pair<List<A>, List<B>> =
   map(fc).unzip()