Add formatting support to the ensure macro

[liamaharon]

          Not sure if `ensure!` can do formatting.

Originally posted by @ggwpez in #14241 (comment)

---

Unlike assert, ensure does not support string formatting.

[ggwpez]

I am not sure if it ever could - since we use it in no-std and there is no format!.
Other thing is that we normally use it with DispatchError and that requires &'static str, so not even format! would help.

[bkchr]

Yeah, this makes no sense. In contrast to assert, ensure doesn't take any string and thus should not support any kind of formatting. The second argument can be anything and is just the return if the check fails.