Add BBR Congestion Control Strategy

[mjpt777]

Add BBR, possibly BBR v2, support to both Java and C media drivers. BBR allows for slightly better throughput and latency compared to Cubic for a system like Aeron on a potentially congested network. BBR would enable better performance for Aeron over the Internet or in a congested cloud environment by helping avoid buffer bloat when probing for maximum throughput at lowest latency.

This would be an additional optional strategy which could be enabled for either driver.