allow disabling first level of scope indent

[LokiNaBoki]

Problem

If you have the scope indents enabled, there is no option or hook to disable them in the first column.

As far as I can remember the show_first_indent_level option from V2 worked for both regular and scope indents. Now there is just hide_first_space_indent_level which hides only regular indents.

I made this hook to get rid of scope indents in the first column:

hooks.register(
    hooks.type.VIRTUAL_TEXT,
    function(_, _, _, virt_text)
        if virt_text[1] and virt_text[1][1] == '┃' then
            virt_text[1] = { ' ', { "@ibl.whitespace.char.1" } }
        end
                                                                 
        return virt_text
    end
)

but it feels really hacky. I have to hardcode the values: '┃' and { ' ', { "@ibl.whitespace.char.1" } }, instead of using indent.whitespace.INDENT and indent.whitespace.SPACE as in the built-in hook.

Expected behavior

The expected behavior is to have something like indent.whitespace enum, but for the scoped indents