Add caching for DataTable._get_row_renderables()#5959
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The$O(m^2)$ times for each rendered row where $m$ is the number of columns. This speeds up the execution of certain benchmarks by 50x.
DataTablewidget appears slow to load and scroll when the number of columns is large. This PR improves the situation by adding a cache for the_get_row_renderables()method, which is calledMore details (including a benchmark script) can be found at Discussion #5953.