[WIP] Add support for MPContribs.

[deepanshs]

• Convert each sites to mpcontribs card.

[codecov]

Codecov Report

Merging #37 (2b64242) into master (01b4472) will decrease coverage by 0.01%.
The diff coverage is 99.52%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   99.98%   99.97%   -0.02%     
==========================================
  Files         100      103       +3     
  Lines        6605     6796     +191     
==========================================
+ Hits         6604     6794     +190     
- Misses          1        2       +1     

Impacted Files	Coverage Δ
src/mrsimulator/spin_system/tests/test_site.py	100.00% <ø> (ø)
...mrsimulator/spin_system/tests/test_spin_systems.py	100.00% <ø> (ø)
src/mrsimulator/transition/pathway.py	98.57% <50.00%> (-1.43%)	⬇️
src/mrsimulator/__init__.py	100.00% <100.00%> (ø)
src/mrsimulator/contribs/__init__.py	100.00% <100.00%> (ø)
src/mrsimulator/contribs/base.py	100.00% <100.00%> (ø)
src/mrsimulator/contribs/tests/test_contribs.py	100.00% <100.00%> (ø)
src/mrsimulator/simulator/tests/test_simulator.py	100.00% <100.00%> (ø)
src/mrsimulator/spin_system/__init__.py	100.00% <100.00%> (ø)
src/mrsimulator/spin_system/site.py	100.00% <100.00%> (ø)
... and 3 more

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