Parallelize lipid Identification step

[PMSeitzer]

Try swapping

    for (auto& g : groups) {
        MzKitchenProcessor::assignBestLipidToGroup(
                    &g,
                    compoundIons,
                    params,
                    debug);
    }

With

    #pragma omp parallel for num_threads(16) schedule(dynamic)
    for (auto& g : groups) {
        MzKitchenProcessor::assignBestLipidToGroup(
                    &g,
                    compoundIons,
                    params,
                    debug);
    }

In MzKitchenProcessor::matchLipids_LC()
To speed up the identification process

[PMSeitzer]

As a part of this work, update the Execution time message to include timing for the lipid searching part.