Allow alternate key for DataTable `id`

[lindseywild]

The key for <TableRow> and it’s associated children is generated based off of the id of the passed in data. It would be helpful to be able to customize the key that is used for id since id may not always exist in the data. For instance, I have a private _uid field that I’d prefer to generate the key off of. In my case, the user has access to update the id field so this may results in duplicate keys if they choose the same id.

Example data:

const sampleData = [
    {id: 1, name: 'Sabine', cuisine: 'Italian', location: 'New York', rating: 4.5, _uid: 'abc123'},
    {id: 2, name: 'The Matador', cuisine: 'Mexican', location: 'Los Angeles', rating: 4.0, _uid: 'abc12334'},
    {id: 3, name: 'Nagoya Steakhouse', cuisine: 'Japanese', location: 'San Francisco', rating: 4.2, _uid: 'abc1234'},
  ]

[sunnyi101]

Fr to look into next steps here

[francinelucca]

Will be closed by #5907, removing from FR board as this should be able to follow normal review-merge pipeline