Remove temporary folder setting in vNext

[t1m0thyj]

Since ZE v3 uses the FileSystemProvider and stores files in memory, we should be able to remove the following settings and any code related to the temp folder (creation, cleanup, etc)

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[JTonda]

Document for V3 that temporary folder is no longer used and that extenders should listen for events instead. Also document how they would access these resources.

Consider a blog on this.