Add Jump Translational DIffusion model

[henrikjacobsenfys]

Also identified an issue with units for diffusion models. For now, only default units will be allowed. When all diffusion models are implemented I will look into allowing different units in diffusion models. #79
Closes #78

#69 should be merged in first

[codecov]

Codecov Report

❌ Patch coverage is 99.22680% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.22%. Comparing base (2ef5011) to head (acff6fc).
⚠️ Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easydynamics/sample_model/sample_model.py	97.50%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #80      +/-   ##
===========================================
+ Coverage    97.83%   98.22%   +0.38%     
===========================================
  Files           16       22       +6     
  Lines          786     1128     +342     
===========================================
+ Hits           769     1108     +339     
- Misses          17       20       +3     

Flag	Coverage Δ
unittests	98.22% <99.22%> (+0.38%)	⬆️

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[henrikjacobsenfys]

Too many merge conflicts, made #95 instead.