Feature request: Add `n_Obs` column to `htest` summary outputs, etc.

[rempsyc]

Follow-up to easystats/parameters#621.

add a column to the summary outputs for htest objects containing sample size or number of observations information.

not only that (/yet, better), but including the whole observed (and the expected?) table for a chi-squared test , like in summarytools::ctable or (with a more similar display) in compareGroups::createTable