Fixed missing __init__.py causing module not found + "TypeError: must be str, not bytes"

[andrewvmail]

Running b2bua_radius after installation causes a crash with strack trace below.

Traceback (most recent call last):
  File "/home/andrew/.pyenv/versions/3.10.14/bin/b2bua_radius", line 5, in <module>
    from sippy.b2bua_radius import main_func
  File "/home/andrew/.pyenv/versions/3.10.14/lib/python3.10/site-packages/sippy/b2bua_radius.py", line 50, in <module>
    from sippy.Rtp_proxy.session import Rtp_proxy_session
  File "/home/andrew/.pyenv/versions/3.10.14/lib/python3.10/site-packages/sippy/Rtp_proxy/session.py", line 38, in <module>
    from sippy.Rtp_proxy.Cmd.sequencer import Rtp_proxy_cmd_sequencer
ModuleNotFoundError: No module named 'sippy.Rtp_proxy.Cmd'

[andrewvmail]

When running b2bua_radius configured with a radiusclient, the application will output below error.

Traceback (most recent call last):
  File "/Users/momo/.local/bin/b2bua_radius", line 8, in <module>
    sys.exit(main_func())
             ~~~~~~~~~^^
  File "/Users/momo/.local/pipx/venvs/sippy/lib/python3.13/site-packages/sippy/b2bua_radius.py", line 901, in main_func
    ED2.loop()
    ~~~~~~~~^^
  File "/Users/momo/.local/pipx/venvs/sippy/lib/python3.13/site-packages/sippy/Core/EventDispatcher.py", line 275, in loop
    self.elp.procrastinate()
    ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/momo/.local/pipx/venvs/sippy/lib/python3.13/site-packages/elperiodic/ElPeriodic.py", line 120, in procrastinate
    self._elpl.prdic_procrastinate(self._hndl)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
KeyboardInterrupt