[ENH] Select Rows: Add annotated data output

[BlazZupan]

Issue

Widget outputted only selected or unselected data, whereas in a number of cases one would benefit to have data with the Selected column, especially if selection would be performed on a combination or continuous meta attribute(s) and then used to test if we can predict the grouping.

Description of changes

Added an output channel (Data).

Includes

• Code changes
• Tests
• Documentation

[ajdapretnar]

This doesn't seem to work as it should.
No matter what I do, the second row is selected. I tried iris, titanic and housing data sets, and they all display erroneous behaviour.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d9fc33a). Click here to learn what that means.
The diff coverage is 96.55%.

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