[libc++][ranges] Implement `permutable`.

Differential Revision: https://reviews.llvm.org/D119222

NOKEYCHECK=True
GitOrigin-RevId: 8f1d8785df928040a9ee964eca02f95eb114182a
diff --git a/include/module.modulemap b/include/module.modulemap
index 442958b..5ef2c1c 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -628,6 +628,7 @@
       module next                  { private header "__iterator/next.h" }
       module ostream_iterator      { private header "__iterator/ostream_iterator.h" }
       module ostreambuf_iterator   { private header "__iterator/ostreambuf_iterator.h" }
+      module permutable            { private header "__iterator/permutable.h" }
       module prev                  { private header "__iterator/prev.h" }
       module projected             { private header "__iterator/projected.h" }
       module readable_traits       { private header "__iterator/readable_traits.h" }