Add SPI for setting media cache and key location on _WKWebsiteDataStoreConfiguration
Created attachment 374518 [details] Patch
Created attachment 374611 [details] Patch
Created attachment 374625 [details] Patch
Created attachment 374651 [details] Patch
I verified the test does not time out on Mojave or Catalina.
http://trac.webkit.org/r247733
<rdar://problem/53458848>