Memory profiling for fun and profit

AllocationList::only_group_max_total_usage_first_seen_at_least

fn only_group_max_total_usage_first_seen_at_least(
    self: AllocationList,
    duration: Duration
) -> AllocationList

Returns a new AllocationList with only the allocations that come from a stack trace whose total maximum memory usage first peaked after at least duration from the start of profiling.