Have cache location configurable (ex: for running off RAM disk)

[bsclifton]

Carried over from brave/browser-laptop#321

User reports if you go into your profile directory and symlink your cache (to a RAM disk for example), the Chromium code will overwrite the symlink at launch

A work-around for folks wanting to do this would be to have two profiles (and if available, sync). They could launch using the --user-data-dir-name param (with an absolute path)

[TudorHulban]

Hi Guys,
Do we still need to cache on SSD instead of RAM disk, is there a documentation entry on how it should work?
Thank you!