[SYCL][SPIRV] Enable only required extensions for SPIRV Backend. #20584
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SPIR-V backend recently started to support extensions not supported by drivers (e.g. SPV_KHR_float_controls2). At the same time, SPIR-V backend doesn't support the syntax for disabling specific extensions (i.e. --spirv-ext=-). We need to come up with a list of SPIR-V extensions that are supported by the backend, but also by the driver. This patch introduces the first approach for such a list.