feat: add Python bindings

[mmailhos]

Generated bindings for Python.

e.g.

def test_hnsw_index():
    """Test HNSWIndex functionality."""
    print("Testing HNSWIndex...")
    
    # Create vectors
    vectors = [
        vectorlite.Vector(id=0, values=[1.0, 0.0, 0.0]),
        vectorlite.Vector(id=1, values=[0.0, 1.0, 0.0]),
        vectorlite.Vector(id=2, values=[0.0, 0.0, 1.0]),
    ]
    
    # Create index
    index = vectorlite.HNSWIndexWrapper(dimension=3, vectors=vectors)
    assert len(index) == 3
    assert index.dimension() == 3
    assert not index.is_empty()
    print(f"✓ HNSWIndex creation: {index}")
    
    # Test search
    query = [1.0, 0.0, 0.0]
    results = index.search(query, k=2)
    assert len(results) == 2
    print(f"✓ HNSWIndex search: {results}")