This is a fix for #62003.
This fixes a UX problem that's easy to observe when using a trackpad, particularly on a MacBook:
It's almost impossible to scroll purely vertically, so on files with long lines a horizontal drift can occur which means the first few character columns might drift under the gutter even when the scroll intent was purely vertical.

This PR adds a boolean to the editor configuration (editor.scrollPredominantAxisOnly). When enabled it scrolls only the predominant axis. This prevents unintentional scroll drift, i.e. slightly diagonal scrolling when scrolling only one axis was intended.

Furthermore, I propose this to be the new default since for almost all software that presents text (or code) this is the standard behavior. The current behavior is standard only in graphic-centric applications where moving diagonally is intended more often.