Add ability to select table rows/columns

[b-kelly]

Reported on Meta.SE

Is your feature request related to a problem? Please describe.

When trying to select a row of a table in the rich editor, you select only the contents of a single cell. If you drag further you select the contents of the next cell, etc. There is no way to select the entire row.

Can we please make it such that we can do the intuitive thing here and select an entire row and remove it by pressing backspace / delete. Instead of having to go through the dropdown-menu to remove a row.