This CL refactors WasmInternalFunction to no longer inherit from Foreign
but instead contain a (sandboxed) ExternalPointer field for the call target.

Bug: v8:10391
Change-Id: Iaaf25e635a275d7570e09699be3c8dec6108d4b3
Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng,v8_linux_arm64_sim_heap_sandbox_dbg_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3782675Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81957}