Eventually you should be able to do this in SmartThings with the official Rules API feature (which is still in development). Meanwhile, webcore is very popular in the community (The topic title is a clickable link)
As far as other hubs that support it, There are some. They all have pluses and minuses and since you can do this with Webcore now, I’m not sure this feature by itself would be enough to justify going to another hub if you are otherwise happy with smartthings. But to find others, just search for “adjustable fade rate home automation.”
Just off the top of my head…
Philips Hue has this for anything connected to its bridge.
Some Lutron systems like RA2 have this feature, but the model line that works with smartthings, Lutron Caseta, does not.
HomeKit has it, but it’s not exposed in the official app, you have to use one of the other available apps like Home+.
Legrand has it for their more expensive lighting systems.
Other expensive systems like Crestron and control4 have it.