Where() clause with many-to-many relation is missing (solution in description)

Solution in 3 steps:

1) Add new interface method to IManyToManyMapper interface:

public interface IManyToManyMapper : IColumnsMapper
{
...
void Where(string sqlWhereClause);
...
}

2) Implement new method in ManyToManyCustomizer class:

public void Where(string sqlWhereClause)
{
customizersHolder.AddCustomizer(propertyPath, (IManyToManyMapper x) => x.Where(sqlWhereClause));
}

3) Implement new method in ManyToManyMapper class:

public void Where(string sqlWhereClause)
{
manyToMany.where = sqlWhereClause;
}

Note) manyToMany field of ManyToManyMapper class contains a lot of interesting fields. I think these fields can be accessed in mapping by-code feature using the same approach. Need to extend IManyToManyMapper interface directly, or add additional parent interfaces to it.