[Desktop] Allow users to add site exceptions for data that is cleared "on exit"

Description

As it is now, any data type that is checked in the Clear browsing data --> [On exit] will have all data of that type removed upon closing the browser. While this is the intended function, we should implement a function similar to what Microsoft Edge does, where site exceptions can be added to a "Do not clear" list. Data on this list is ignored when the browser runs "clear on exit":

This would help users maintain login data for sites they regularly visit and not have to re-authenticate every time data is erased. Additionally, this helps with support, since clearing browsing data often resolves issues with bad cache data -- having the ability to suggest users do this, but without sacrificing specific data they know they want would be very useful and appreciated by users

Miscellaneous Information:

Original thread that bought this to my attention (again): https://community.brave.com/t/delete-all-cookies-on-exit-except-allowed-list/137872/5