Function calculate_frame_occurrences_emg_par

pub fn calculate_frame_occurrences_emg_par(
    retention_times: &[f64],
    rts: Vec<f64>,
    sigmas: Vec<f64>,
    lambdas: Vec<f64>,
    target_p: f64,
    step_size: f64,
    num_threads: usize,
    n_steps: Option<usize>,
) -> Vec<Vec<i32>>