refactor!: remove set_dynamics() method

[redeboer]

• Renamed HelicityAmplitudeBuilder.dynamics_choices to HelicityAmplitudeBuilder.dynamics
• Use DynamicsSelector.assign instead of HelicityAmplitudeBuilder.set_dynamics():

  model.dynamics.assign("f(0)(980)", create_relativistic_breit_wigner)
  
  # used to be:
  # model.set_dynamics("f(0)(980)", create_relativistic_breit_wigner)

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