Long label scrolling mode for the widget `lv_roller`

Long label scrolling mode for the widget lv_roller.
Many times a longer text then the width of the roller is loaded, such as a file name list for file selection. Making it difficult to select the correct file. The font size reduction works to a certain extent where it becomes difficult to read on smaller screens.

I know there are other ways to implement this, but it would be convenient to have this feature when a nice roller is intended to be used.

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