add paired samples style to a new jjwithinstats2 function

[sbalci]

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[sbalci]

https://github.com/jamovi/jmv/blob/master/R/ttestps.b.R https://github.com/jamovi/jmv/blob/master/jamovi/ttestps.a.yaml https://github.com/jamovi/jmv/blob/master/jamovi/ttestps.r.yaml https://github.com/jamovi/jmv/blob/master/jamovi/ttestps.u.yaml