[refactor] Introduce VisitStack choke point.

This decouples the stack trace visitation logic from the creation
of actual stack frame objects, in preparation to introduce a
second kind of stack frame object (`v8::internal::StackFrameInfo`
as part of http://crrev.com/c/3302794) in addition to the existing
`v8::internal::CallSiteInfo`.

Doc: https://bit.ly/v8-stack-frame
Bug: chromium:1258599, chromium:1278647, chromium:1278650
Change-Id: I398933653e29cc2fe5c222526d9dd686ef8239b4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3334781
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78374}