Implementation of Bitwise operands

[peter-gribanov]

This is a implementation of the Bitwise operands from #169 feature.

You can use bitwise operations in specifications such as &, |, ^, <<, >>, ~.

For example, check the access for reading something with a bit mask:

// DQL: (u.access & 0100) = 0100
$spec = Spec::eq(Spec::bAnd('access', UserAccess::READ), UserAccess::READ);

You can put bitwise operations in each other. For example, select not readed mails:

// DQL: (m.status & (~ 0100)) = m.status
$spec = Spec::eq(
    Spec::bAnd(
        Spec::field('status'),
        Spec::bNot(Spec::value(MailStatus::READED))
    ),
    Spec::field('status')
);