`A4-5-1`:  Ignore bitmask types

### Affected rules
 - `A4-5-1`

### Description

We need to implement the "bitmask types" exception for this query:

> It is allowed to use the enumeration as operand to all built-in and overloaded operators if the enumeration satisfies the “BitmaskType” concept [16].

### Example
```cpp
enum class byte : std::uint8_t{};
```
