Add data_and_model_to_datagroup method

[henrikjacobsenfys]

This allows users to easily extract the data and all components in the model for customising their plots.
Closes #171

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.12%. Comparing base (6cc5b8d) to head (161c47e).

Files with missing lines	Patch %	Lines
src/easydynamics/analysis/analysis.py	93.54%	1 Missing and 1 partial ⚠️
src/easydynamics/analysis/analysis1d.py	96.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #176      +/-   ##
===========================================
+ Coverage    98.05%   98.12%   +0.06%     
===========================================
  Files           45       45              
  Lines         2825     2874      +49     
  Branches       496      511      +15     
===========================================
+ Hits          2770     2820      +50     
- Misses          33       34       +1     
+ Partials        22       20       -2     

Flag	Coverage Δ
integration	48.15% <4.54%> (-0.77%)	⬇️
unittests	98.12% <95.45%> (+0.06%)	⬆️

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[rozyczko]

Potential validation issues raised.

[rozyczko]

looks good!