Add keyboard shortcut to reorder focused tab strip item

Demo: https://screencast.googleplex.com/cast/NTM2ODQ4NDM3OTc1NDQ5NnwxM2FjNGVkMS01Yg

Demo with slow reordering animations: https://screencast.googleplex.com/cast/NDY2ODg5OTMwMjgzNDE3NnwxYjBjYzYwOS00OQ

NO_IFTTT=Changing label only to mark as implemented, not changing buckets

Bug: 402775002, 40916028
Change-Id: I30926eb29a9712b26ba8542e49de4ee4e99954e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6792438
Reviewed-by: Neil Coronado <nemco@google.com>
Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
Commit-Queue: Jenna Himawan <jhimawan@google.com>
Reviewed-by: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/main@{#1497605}