Position of the subfigures' reference numbers

[AlbertoFabbri93]

It would be nice to have an option to position the subfigures' numbers in a specific position, like in the top left corner.

This is an example from a comment on the Typst repo:

[tingerrr]

This does add quite a bit of complexity when it comes to captioning sub figures, I'll see if this fits into a newer design of subpar.

Although, I've looked at ways of simply upstreaming sub figures into native Typst directly, which I hope will solve most of the shortcomings of this package.