feat: split samples to sample and control bits

chore: remove octets_to_sample, put its behavior to transport_layer

Merge pull request #14 from Rutherther/feat/add-frame-clock

Add frame clock handling

tests: update octets_to_samples tests

feat(transport): add testbenches for transport layer

Simple 1 lane CF = 0, 1 lane CF = 1,
multi lane L = 2, CF = 2, M = 4, S = 2 (2 lanes, 2 control words, 4 conventers, 2 samples per frame)