[ScrollArea] Add support for reversed layouts

[joaom00]

Fixes #1585

Added support for reversed layouts in horizontal/vertical orientation. The reversed layout is being checked by the flex-direction CSS property. I don't know if it should be checked in another way or if this is enough :thinking: .

[etienne-dldc]

Hey @benoitgrelard @andy-hook any reason for this to be blocked ?

[jonahseguin]

any updates on this?

[sergeynagorny]

Guys, we need this fix <3

[PedrosoDev]

any updates on this?

[Malachite40]

also looking for a fix