Function process_groups 

pub fn process_groups<S: BuildHasher>(
    groups: &HashMap<String, Vec<String>, S>,
    tool_files: &HashSet<String, S>,
    scores: &HashMap<String, f64, S>,
    catalog: &DecomposedCatalog,
    opts: &ProcessGroupsOptions,
) -> Vec<Value>

Merge grouped decomposed files into final tool schema values.