static <T> QualifiedColumnMapperFactory of(QualifiedType<T> type, ColumnMapper<T> mapper) {
        return (t, config) -> t.equals(type) ? Optional.of(mapper) : Optional.empty();
    }
Create a QualifiedColumnMapperFactory from a given {@link ColumnMapper} that matches
a single {@link QualifiedType} exactly.

@param type the mapped type
@param mapper the mapper
@param <T> the mapped type
@return A {@link QualifiedColumnMapperFactory}
core/src/main/java/org/jdbi/v3/core/mapper/QualifiedColumnMapperFactory.java