Add tools to analyze latency, bandwidth, etc

[maxsvetlik]

It would be helpful to have some tools that could identify possible strengths or weaknesses of the bluetooth_bridge suite as a multi-robot communication system.

In addition to raw statistics like cross-machine message latency and bandwidth, it is prudent to analyze how these things scale when resources become scarce, i.e. when

1. more than 1 agent is connected at the same time
2. agents are sharing large messages such as video streams

[maxsvetlik]

This could also be useful in the context of #4 and #5 to see how compression and message saturation effect the above statistics