[cleanup] Move Array.p.sort Torque code into its own file

R=jgruber@chromium.org

Bug: v8:7382
Change-Id: I5b92f46736d8c0ca8ef0f187ecaa1d58661a1c7f
Reviewed-on: https://chromium-review.googlesource.com/1101690Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#53778}

BUILD.gn

@@ -873,6 +873,7 @@ torque_files = [
   "src/builtins/base.tq",
   "src/builtins/array.tq",
   "src/builtins/array-foreach.tq",
+  "src/builtins/array-sort.tq",
   "src/builtins/typed-array.tq",
   "src/builtins/data-view.tq",
   "test/torque/test-torque.tq",