This CL implements the equivalent of ETW in macos (called Signposts)

Bug: v8:11043
Change-Id: Ifa72cfd17fca81b18e3e8b1003fd6ab72de3c986
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2807157
Commit-Queue: Sara Tang <sartang@microsoft.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73856}