Array2D conformance to Swift.Collection

[vkondrashkov]

Feature proposal

I want to suggest you to extend Array2D with Swift.Collection to make it possible to use this collection in enhanced methods of CollectionViews

Alternatives

Make own Swift.Collection and conform it to QueryableSectionedDataSourceProtocol and SectionedDataSourceChangesetConvertible protocols.

Motivation

I have faced with this problem at my project, when I needed to implement sectioned table view with unique cells. It's possible to solve this problem with method bind(to:animated:rowAnimation:createCell:), but only SectionedDataSourceChangesetConvertible collections are able to bind table view in such way. And framework have such one: Swift.Array. Its problem is QueryableSectionedDataSourceProtocol conformance, where it returns numberOfSections equal to 1.

For this issue very convenient to use Array2D, but it can't conform to SectionedDataSourceChangesetConvertible due to it's not a Swift.Collection

As a result I have created this pull request.

Additional

Documentation or tests can be appended.