Accessibility scrolling enhancements

[andrewwilliams]

Details

When scrolling the CalendarView via accessibility methods (specifically using the 3 finger swipe with voiceover), the related scrolling delegate methods (didScroll, didEndDragging, and didEndDecelerating) were not called.

This could lead to missing functionality for surfaces which relied on those callbacks to implement functionality, such as loading new data from the network when scrolling to new a new data range.

This PR adds those callbacks to the accessibilityScroll method, ensuring that they're fired whenever a user scrolls - whether through accessibility means or not.

Related Issue

Motivation and Context

How Has This Been Tested

Tested changes in example app on device to ensure that the relevant delegate methods are called.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[jpsoultanis]

🎉

[bryankeller]

Thanks Andrew! Left one comment / question. Also, could you update the CHANGELOG.md? This can be under the "Fixed" section.