**Warning, this fix contains changes which will change the default behavior of core functions:**

* Default behavior of Optics is changed when AT lattice is loaded: now default to optic function to s=0 instead of average ones.
* Default behavior of LongRangeResistiveWall and ImpedanceModel when an AT lattice is loaded is to normalized by average_beta / local_beta
* Adds Optics.average_beta attribute
* Add pytest markers for tests and update .gitlab-ci.yml and pyproject.toml files.

Code modifications:

* [Fix] adts in TransverseMapSector
* ComplexData.name_and_coefficients_table is now a staticmethod.
* Extend WakeField to "mixed" componenets (xydip, yxdip, ...).
* Small fix/improvements for rf.py (CavityResonator for n_bin=1)
* [Fix] WakePotential.check_sampling method.
* [Fix] Sweep.plot method.
* Add Element.track_bunch_if_non_empty decorator.
* Modify Bunch.binning to add a return_full_length optional parameter.
* Modify Mpi.share_distributions for n_bin=1.
* Modify TransverseSpaceCharge to work with track_alive = True.
* Modify WakePotential for n_bin=1 and use track_bunch_if_non_empty decorator.
* [Fix] IntrabeamScattering for nonuniform fills with Beam.mpi_switch == False
* Modify PhysicalModel to return errors if needed.
* Update BeamIonElement

Project management:

* Update pyproject.toml and poetry.lock with pytest-mock
* Add assert_attr_changed test function.

1) Adds a beam_ion_effects module. Beam-ion interaction is implemented with weak-strong, strong-strong and Particle-In-Cell models.
New classes: BeamIonElement, IonParticles, IonAperture, IonMonitor
2) Adds space-charge module, implementing TransverseSpaceCharge class.
3) Adds electromagnetic fields module. Handles Faddeeva function and electromagnetic fields for space-charge and beam-ion interactions.

Other minor improvements are made to the code.

Add poetry.lock file
Fix imports in feedback.py