Adding updates for recording simulation's forward and reverse events, documenting adaptive routing congestion sensing conditions for Xu

Adding sampling examples in synthetic workload test program, fixing a reverse handler bug in synthetic workload test

Fixing the contiguous memory allocation bug with dragonfly router sampling, sampling struct had two dynamic arrays so a contiguous fwrite wasn't working

Adding sampling for dragonfly routers (in progress), updating binary read file utility to read router samples

(i) Adding sampling for dragonfly compute node LPs (ii) Adding file I/O reader that translates the binary format to text

NOTE: no models implement it yet