Function goose::merge_response_times

pub fn merge_response_times(
    global_response_times: BTreeMap<usize, usize>, 
    local_response_times: BTreeMap<usize, usize>
) -> BTreeMap<usize, usize>

A helper function that merges together response times.

Used in lib.rs to merge together per-thread response times, and in stats.rs to aggregate all response times.