[FeatureRequest] Dev Env Settings Window scrolling

[janosmurai]

The not-fitting items are simply cut off if the list can’t fit in the Tool Image selector panel.

Describe the solution you'd like
Implement the scrolling feature, so the not-fitting items are also accessible.
If the cursor reaches the last list item and the user presses the down arrow or 'j' the cursor should jump back to the beginning of the list. If the cursor is at the first item, pressing the up arrow or 'k' should move the cursor to the last list item.
A scrollbar indicating where the cursor is in the whole list is nice to have but not mandatory.

Additional context
First, the #199 issue should be implemented.
The Textual module has scrollable container objects.

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For axem internal use only:
Jira: https://axem.atlassian.net/browse/DEM-281