Refresh the options map during pre-execution to pave the way for
user land snapshots which may need to access run-time options at
snapshot-building time. The default embedded bootstrap snapshot
is still prevented from accessing them at snapshot building time
since it serves a wider audience and is ignorant of application
states, while the user-land snapshots are meant to be
application-specific and so it makes sense for them to access
runtime states as long as the snapshotted-code
works with re-initialized runtime states.

This adds a --build-snapshot runtime option which is currently only
supported by the node_mksnapshot binary, and a --node-snapshot-main
configure option that makes use it to run a custom script when
building the embedded snapshot. The idea is to have this experimental
feature in core as a configure-time feature for now, and investigate
the renaming V8 bugs before we make it available to more users via
making it a runtime option.

Use the mksnapshot cleanup hooks to release the references
to the native streams so that they can be destroyed right
before the snapshot is taken, and move the initialization
of the global console to pre-execution so that they can be
re-initialized during snapshot dehydration. This makes
it possible for user-land snapshots to use the I/O during
snapshot building.

This makes --inspect and stdin/out functional in the embedded snapshot,
currently it's not guaranteed that these work perfectly, the
plan is to investigate any out-of-sync states that might appear
in user land snapshots with this while the it is a configure-time
feature.