Keyboard navigation in memory table

**Description**

The recently introduced GUI framework comes with capabilities to navigate through the table with the keyboard.
A full navigation strategy need to be defined first. But it could include things like
* [X] Navigating through table cells and `groups` within Data column cells.
* [X] Initiate editing a group when the functionality is available.
* [X] Selecting groups for subsequent copy.
* [ ] Quick navigation up and down with PageUp/PageDown/Home/End/etc keys.

**Additional information**

In all of this we need to make sure that the navigation agrees with fundamental Visual Studio Code patterns.