VT: ARTPWriter: Add traffic recorder

Introduce TrafficRecorder class
  - Record amount of bytes that has sent in a same sendAVCData() loop.
    This can be used for another sendXXXData() loop.
  - Record amount of bytes until a new request of Bps printing.

Bug: 165061754
Merged-in: I935ec1f5ba2c1fda94f3f89ebfab60c8b5d91cf4
Change-Id: I935ec1f5ba2c1fda94f3f89ebfab60c8b5d91cf4
Signed-off-by: Kim Sungyeon <sy85.kim@samsung.com>