public AndSpecification(IAsyncSpecification <TEntity> leftSpec, IAsyncSpecification <TEntity> rightSpec)
{
_leftSpec = leftSpec;
_rightSpec = rightSpec;
}
public static IAsyncSpecification <TEntity> Or <TEntity>(this IAsyncSpecification <TEntity> @this, IAsyncSpecification <TEntity> other)
where TEntity : BaseEntity => new OrSpecification <TEntity>(@this, other);
