Draft: Helper to calibrate scintillators

Closes #139

• Merge the code from @pautran into tomo.helpers.scintillator_tilt
  • Plus rework for typing and simplification
  • Plus some tests
• Create a scintillator_geometry getter for any optics
  • This can be redefined if needed, but by default it returns the scintillator_geometry key from the yaml config
• Use the scintillator_tilt in alignxc
• Added test coverage for alignxc

Some commits are related to typo or bug fixes, ill also create dedicated PRs to merge them independently to the project.

Description

The scintillator geometry can be described the following way in any optics.

  scintillator_geometry:
    rz:
      screw_distance_mm: 28.65
      screw_pitch_mm: 0.25
      screw_position: "top right"
      orientation: -1
    ry:
      screw_distance_mm: 9
      screw_pitch_mm: 0.25
      screw_position: "bottom left"
      orientation: 1

Alignment with alignxc

If the geometry description is provided, alignxc will display such result

Vertical   tilt in deg (thy): 7.588151962071096e-09
Horizontal tilt in deg (thz): 7.30439453496733e-09

For axis 'ry' (bottom left screw):
 - Displacement Distance: 0.0000 mm
 - No turns needed.
For axis 'rz' (top right screw):
 - Displacement Distance: 0.0000 mm
 - No turns needed.