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This makes the class available to custom MP4-parsing implementations, while also allowing it to be used by `muxer` in future. 'Box' is the term used throughout the ISO 14496-12 spec, while the 'Atom' nomenclature was used in an earlier form of the spec (Quicktime). This change moves it from `extractor.mp4.Atom` to `container.Mp4Box`, to be consistent with existing MP4-specific types in the `container` module like `Mp4TimestampData`. PiperOrigin-RevId: 663274752