Highlight statusline numbers for selected range of text.

[DimitrisZav]

I think the title is a bit self explanatory, I will add a gif that displays this kind of functionality on other text editors. Although I am not a fan of changing the colors, I think that simply changing all the numbers of the highlighted lines to the color for the current line would be optimal.
I had something like this for the default status line that gets the start and and of the selection region with vim.fn.line("v") and vim.fn.line("."). Then using an if statement I changed the fg colors of the numbers in that region.