Add a constraints param on Get.bottomSheet method

[nggepe]

In the desktop app, the bottomSheet needs to have its max width increased if we want it to match the width of the media query.
If I use the showModalBottomSheet feature, which is a default feature in Flutter, I can set up constraints on it so that I can make it match the width of the media query. But It has to pass the context into it.

I thing it would be nice if the Get.bottomSheet has the constraints parameter.

Thanks