Change DumpableBox to dump recursively

PiperOrigin-RevId: 510433206

libraries/test_data/src/test/assets/muxerdumps/audio_sample_entry_box_mp4a.dump

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libraries/test_data/src/test/assets/muxerdumps/dinf_box_empty.dump

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+dinf (36 bytes):
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libraries/test_data/src/test/assets/muxerdumps/hdlr_box_metadata.dump

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libraries/test_data/src/test/assets/muxerdumps/ilst_box.dump

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libraries/test_data/src/test/assets/muxerdumps/keys_box.dump

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libraries/test_data/src/test/assets/muxerdumps/uuid_box_XMP.dump

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libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_av1.dump

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libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h264.dump

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libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265.dump

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libraries/test_data/src/test/assets/muxerdumps/video_sample_entry_box_h265_hdr10.dump

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+hvc1 (240 bytes):
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