feat: implement python bindings of query engine

[JabobKrauskopf]

I implemented the python bindings for the rust part of the query engine. The query engine part in _medmodels.pyi should have the same functionality as described in querying.pyi (but not necessarily the same naming. The _medmodels.pyi uses rust naming conventions)

Expected tests to fail:

• medmodels/medrecord/tests/test_builder.py
• medmodels/medrecord/tests/test_datatype.py
• medmodels/medrecord/tests/test_indexers.py
• medmodels/medrecord/tests/test_medrecord.py
• medmodels/medrecord/tests/test_overview.py
• medmodels/medrecord/tests/test_schema.py
• medmodels/treatment_effect/matching/tests/test_classic_distance_models.py
• medmodels/treatment_effect/matching/tests/test_metrics.py
• medmodels/treatment_effect/matching/tests/test_propensity_score.py
• medmodels/treatment_effect/tests/test_continuous_estimators.py
• medmodels/treatment_effect/tests/test_temporal_analysis.py
• medmodels/treatment_effect/tests/test_treatment_effect.py