add Scroll Beyond Last Line

[txwdzxq]

hope the bottom of the document can continue scrolling, even after reaching the end of the file.

like vscode settting editor.scrollBeyondLastLine

[arkology]

This already exists in EditorSettings. text_editor/behavior/navigation/scroll_past_end_of_file

[txwdzxq]

my bad, I didn't find this feature before
thanks