Add USM shared and device memory to unit testing

[SergeyKopienko]

Added USM shared and device memory to unit testing:

• implementer new class sycl_usm_helper:
  • USM shared/device memory allocation;
  • copy host data into USM shared/device memory;
  • retrieve data from USM shared/device memory to host data;
  • deallocate USM shared/device memory in destructor;
• added usage of class sycl_usm_helper in tests;
• some functions in tests now implemented as template <sycl::usm::alloc alloc_type>:
  • for example, in main() function of zip_iterator.pass.cpp now implemented like this:
    int32_t
    main()
    {
    #if TEST_DPCPP_BACKEND_PRESENT
    // Run tests for USM shared memory
    test_buffers<sycl::usm::alloc::shared>();
    // Run tests for USM device memory
    test_buffers<sycl::usm::alloc::device>();
    #endif
    return done(TEST_DPCPP_BACKEND_PRESENT);
    }
• added ability of usage these functions for testing of USM shared memory (by template parameter sycl::usm::alloc::shared) and USM device memory (by template parameter sycl::usm::alloc::device;