E1 Setup enc/dec library and unit test

Guido Casatirequested to merge
e1-setup-encdec-tests into develop

This MR is adding a library for E1 Setup enc/dec functions:

  • E1 CU-UP Setup Request
  • E1 CU-UP Setup Response
  • E1 Setup Failure

and relevant unit tests

Edited by Guido Casati

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