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This change uses this new method everywhere we currently `instanceof` check an `Extractor` directly. This allows us to introduce wrapping/delegating `Extractor` instances - because the `instanceof` checks will continue to operate on the underlying instance. HLS is a slightly different case, because it directly re-instantiates `Extractor` instances, which is not compatible with an arbitrary wrapping structure. Luckily the only `Extractor` instances that HLS re-instantiates do not support muxed subtitles, so won't be wrapped in the first place (although future changes might use the delegating-`Extractor` pattern for other purposes, which might affect HLS). PiperOrigin-RevId: 542550928