`A4-5-1`: Ignore bitmask types

[lcartey]

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

enum class byte : std::uint8_t{};