Reduce indexing boilerplate for serializable/transferrable objects. (#36624)HEADmain

Rather than creating unique types for each pipeline-namespaced index
type (eg. MessagePortId, DomExceptionId, etc.), we can create a generic
common type that uses a marker to prevent type confusion. This change
allows us to reduce the boilerplate code required when implementing
serializable/transferable interfaces, since the structured clone
implementation can rely on the common type.

Testing: Existing WPT tests for serialization and transferring provide
coverage.

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Signed-off-by: Josh Matthews <josh@joshmatthews.net>

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