Ensure that device{} == device{default_selector{}}
#888
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The SYCL 2020 specification requires that a default constructed device is the same as a device constructed with the default selector. This PR implements this by forward declaring the
sycl::devicedefault constructor and defining it indevice_selector.hppwheredefault_selector_vis available. The default constructor then just delegates to the already defined constructor that takes any device selector as its argument.