Rework diffusion models

[henrikjacobsenfys]

First draft of these changes: #190

[codecov]

Codecov Report

❌ Patch coverage is 39.56044% with 220 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.26%. Comparing base (fff0285) to head (a5eb112).

Files with missing lines	Patch %	Lines
...mics/sample_model/diffusion_model/delta_lorentz.py	22.03%	184 Missing ⚠️
...mple_model/diffusion_model/diffusion_model_base.py	60.56%	19 Missing and 9 partials ⚠️
src/easydynamics/analysis/fit_binding.py	0.00%	2 Missing and 2 partials ⚠️
...iffusion_model/brownian_translational_diffusion.py	76.47%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #191      +/-   ##
===========================================
- Coverage    98.42%   92.26%   -6.16%     
===========================================
  Files           50       51       +1     
  Lines         3175     3492     +317     
  Branches       576      642      +66     
===========================================
+ Hits          3125     3222      +97     
- Misses          26      233     +207     
- Partials        24       37      +13     

Flag	Coverage Δ
integration	44.93% <34.06%> (-1.25%)	⬇️
unittests	92.12% <38.18%> (-6.31%)	⬇️

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