Make row limit configurable

There are 2 page limits defined in Civi, one for normal searches

CRM/Utils/Pager.php, ROWCOUNT = 50

and another one for the reports

CRM/Report/Form.php, ROW_COUNT_LIMIT = 50

It would be good to make it configurable via UI and add this to 'Search Preferences'

Any thoughts?

Happy to work on PR.

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