Mark Amery 52f350a9cb Add proptypes for scrollview drag start & end handlers
Summary:
`ScrollView` has a bunch of `onFoo` handlers for scrolling-related events, most of which have a proptype defined and are documented. However, `onScrollBeginDrag` and `onScrollEndDrag` do not currently have a proptype and are not currently documented (as noted at https://stackoverflow.com/a/41793747/1709587). It seems reasonable to bring consistency and to provide documentation of these otherwise hard-to-discover props.

I haven't added or run any tests, and don't plan to do so (beyond waiting and seeing that no existing checks fail in CircleCI).

I have also created a PR to update the documentation at https://github.com/facebook/react-native-website/pull/99

*(None needed; this isn't a functionality change.)*
Closes https://github.com/facebook/react-native/pull/17368

Differential Revision: D6642695

Pulled By: TheSavior

fbshipit-source-id: fa40ed2ae6d5947a161b816a47441d8f5d4d9c4d
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