
This updates `AsyncSnapshot.data` to act as `AsyncSnapshot.requireData` used to -- and it removes `AsyncSnapshot.requireData`. Correspondingly, this adds a `StreamBuilder.withoutInitialData()` constructor, makes the `initialData` argument to the default `StreamBuilder()` constructor required, and deprecates the `initialData` argument to the `FutureBuilder()` constructor. See the breaking change announcement for more info. https://github.com/flutter/flutter/issues/34545 https://groups.google.com/forum/#!topic/flutter-announce/H6Od0QdsdrI
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