Move the two extension range helpers out of Descriptor. #1298
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These two apis aren't a normal part of the C++ Descriptor api, so move them out to the plugin level itself so they aren't public api going forward.
As of http://github.com/apple/swift-package-manager/pull/3316 tests can depend on executable targets. The majority of this CL is then adding a new test (only for newer SwiftPM versions) that allows the tests also to have been moved over.