Function syn_projector_batch 

pub fn syn_projector_batch(
    src_area_id: &str,
    dst_area_id: &str,
    neuron_ids: &[u64],
    neuron_locations: &[Position],
    src_dimensions: (usize, usize, usize),
    dst_dimensions: (usize, usize, usize),
    transpose: Option<(usize, usize, usize)>,
    project_last_layer_of: Option<usize>,
) -> BduResult<Vec<Vec<Position>>>

Batch projection for multiple neurons (parallel processing).

PERFORMANCE: Uses rayon for parallel processing of large neuron batches.