bindings: Require creation key for ActiveScriptWrappable

ASW is error prone and may lead to temporary memory leaks. Require users
to add classes to a creation key to acknowledge that they have tried to
keep the object alive through other means.

Change-Id: I5497f21b6fb8a18228b0bdeb85cf8cfe15e25619
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3898697
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1127589}