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Copies `GraphIndexCreator.from_text()` to make an async version called `GraphIndexCreator.afrom_text()`. This is (should be) a trivial change: it just adds a copy of `GraphIndexCreator.from_text()` which is async and awaits a call to `chain.apredict()` instead of `chain.predict()`. There is no unit test for GraphIndexCreator, and I did not create one, but this code works for me locally. @agola11 @hwchase17