fix(link): rename data_link package to data_link_pkg

feat(link): constrain alignment integer in char alignment

feat(link): use character_vector in 8b10b decoder

feat(link): add frame alignment

fix(link): decode control characters correctly. Correctly check for missing disparity

feat(link): auto testing testbench for char alignment

feat(link): add 8b10b decoder

feat(link): add char alignment