stty: add options to set and print terminal size #8221
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cakebaker
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fixes for #3859. adds options for setting the size of the terminal's rows and columns, and printing the current size.
stty rows <n>stty columns <n>orstty cols <n>stty sizei did add some new
unsafeblocks, as ioctl calls are needed to get and set terminal size. i couldn't find documentation of what row/col sizes are accepted by GNU'sstty, but i did some testing and am matching their behavior. i also added tests to confirm this behavior.