[train-archive] Implement command to generate train.zip file

data/testdata/2020021819-3/record_0000001.json

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+{"user/angle":0.04117644,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000001.jpg"}

data/testdata/2020021819-3/record_0000002.json

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+{"user/angle":0.045098066,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000002.jpg"}

data/testdata/2020021819-3/record_0000003.json

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+{"user/angle":0.045098066,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000003.jpg"}

data/testdata/2020021819-3/record_0000004.json

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+{"user/angle":0.04117644,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000004.jpg"}

data/testdata/2020021819-3/record_0000005.json

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+{"user/angle":0.04117644,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000005.jpg"}

data/testdata/2020021819-3/record_0000006.json

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+{"user/angle":0.043137312,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000006.jpg"}

data/testdata/2020021819-3/record_0000007.json

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+{"user/angle":0.04117644,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000007.jpg"}

data/testdata/2020021819-3/record_0000008.json

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+{"user/angle":0.045098066,"cam/image_array":"/tmp/record//2020021819-3/cam/cam-image_array_0000008.jpg"}