Add support for multi-row inputs

[hanskokx]

Is your feature request related to a problem? Please describe.
My PIN is 12-digits. When I try to implement pinput with that many fields, the fields are too small.

Describe the solution you'd like
I would like to be able to specify how many pinput inputs I'd like per row and let inputs wrap to new rows.

Describe alternatives you've considered
I've considered forking the package and implementing this myself.

[hanskokx]

I've started trying to implement the logic here but I'm having a strange issue where multiple inputs think they're being selected at the same time (and I can't change the item index for items on the second row). I'll keep poking at it but some developer input would be greatly appreciated.