Add support for Split.ALL
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['Honestly, I think we should fix some other issues in Split API before this change. E. g. currently the following will not work, even though it should:\r\n```python\r\nimport datasets\r\ndatasets.load_dataset("sst", split=datasets.Split.TRAIN+datasets.Split.TEST)  # AssertionError\r\n```\r\n\r\nEDIT:\r\nActually, think it\'s OK to merge this PR because the fix will not touch this PR\'s code.']
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The title says it all.
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