[SYCL] Restrict sycl::vec and swizzle operations to types mentioned in the SPEC (#13947)

Follow-up of and blocked by: #13945

For `vec<std::byte>`, we only allow math operations that are valid on
`std::byte` itself. (https://en.cppreference.com/w/cpp/types/byte)

Author: uditagarwal97

sycl/include/sycl/detail/generic_type_traits.hpp

@@ -252,6 +252,16 @@ inline constexpr bool is_genfloatptr_marray_v =
     (IsDecorated == access::decorated::yes ||
      IsDecorated == access::decorated::no);
 
+template <typename T>
+using is_byte = typename
+#if (!defined(_HAS_STD_BYTE) || _HAS_STD_BYTE != 0)
+    std::is_same<T, std::byte>;
+#else
+    std::false_type;
+#endif
+
+template <typename T> inline constexpr bool is_byte_v = is_byte<T>::value;
+
 template <typename T>
 using make_floating_point_t = make_type_t<T, gtl::scalar_floating_list>;