Added test for type_traits

[Przemog1]

Issues I encountered:

• __is_signed returns false for float types, but it should return true.
• __is_unsigned returns true for enum types, but I think it should return false.
• I'm not sure how to implement tests for __is_final, since there is no final keyword.
• I'm not sure how to implement tests for __is_integral, since there is no constexpr.

Status: // * __is_class - DONE // * __is_final - HOW? // * __is_literal - HOW? // * __is_arithmetic - DONE // * __is_scalar - DONE // * __is_floating_point - DONE // * __is_integral - DONE // * __is_complete_type- DONE // * __is_void - DONE // * __is_array - DONE // * __is_const - DONE // * __is_signed - DONE // * __is_unsigned - DONE // * __is_same - DONE // * __is_array - DONE // * __is_empty - DONE

CC: @llvm-beanz

[Przemog1]

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