docs: Add docs for horizontal orientation (#9843)
* prevent orientation from being exposed in S2 for gridlist
* add docs for gridlist orientation
* update ListLayoutOptions to clearer names and document horizontal orientation
* make it a bit smaller
* update virtualizer list example per review
* update gridlist for horizontal
* forgot to remove
* rename rowHeight and other height related properties
* simplify and reduce image size
* Apply suggestion from @yihuiliao
Co-authored-by: Yihui Liao <44729383+yihuiliao@users.noreply.github.com>
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Co-authored-by: Yihui Liao <44729383+yihuiliao@users.noreply.github.com>
