This was recently introduced. so no breaking change. The thing is: * We do not commonly use the prefix Default* even if it can be overridden in the templates. * PagerSize makes more sense and is also the term used in the code.
Also consolidate the pagination configuration into a struct. Closes #12572
Closes #12427 Closes #12485 Closes #6310 Closes #5074
Primary motivation making them easier to find in the code editor.