further optimize triples_with_sp, triples_with_so and triples_with_po

[KonradHoeffner]

Since 0.0.4 they are filtered before translation, which is already better than the Sophia default implementation, but they could be further optimized at the iterator level. Either create new iterators or add parameters to the existing ones.

• [x] triples_with_sp
• [x] triples_with_so
• [x] triples_with_po

[KonradHoeffner]

Done