The header is only slightly refactored:
* function names are slightly shortened,
* global functions and enums are converted to static methods and enums
  of a MemoryProtectionKey class.

This is a first step towards adding PKU support for V8 code space.

Bug: v8:13023
Change-Id: Iebcb075b07286d18d6834fbcf6697327f08c9f50
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3762584Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81732}