Feature/demo benchmarks

[fedjabosnic]

• Added encode/decode latency tracking
  • FIXMessage and FIXMessageWriter now track latency for their encoding/decoding procedures
  • The current implementation is a bit hacky (will improve soon)
• Improved demo benchmarking
  • Introduced the HdrHistogram library (https://github.com/HdrHistogram/HdrHistogram.NET)
    • Used to calculate the various percentiles
    • Results get printed to screen and saved to files in .bench folder
  • Improved benchmarking logic
    • Rtt: trading round trip time
    • Encode: outbound message encoding (user/session fields + checksum/length checks)
    • Decode: inbound message decoding (user/session fields + checksum/length checks)
• Added histogram result files

Benefits

Using this we run/output realistic benchmarks, including charts (see their website):

[fedjabosnic]

Rebased on latest develop