Add reference guide about the state space.

[mo2561057]

Complete reference guide for the new state space.

Todo

• [ ] Add key terms to glossary.

[codecov[bot]]

Codecov Report

Merging #372 into main will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #372   +/-   ##
=======================================
  Coverage   85.43%   85.43%           
=======================================
  Files          47       47           
  Lines        3418     3418           
=======================================
  Hits         2920     2920           
  Misses        498      498           

Flag	Coverage Δ
#end_to_end	74.69% <100.00%> (ø)
#integration	65.03% <100.00%> (ø)
#unit	68.78% <100.00%> (-0.18%)	:arrow_down:

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Impacted Files	Coverage Δ
respy/interpolate.py	95.12% <ø> (ø)
respy/solve.py	100.00% <ø> (ø)
respy/state_space.py	88.05% <ø> (ø)
respy/tests/test_randomness.py	100.00% <ø> (ø)
respy/tests/test_replication_kw_94.py	36.84% <ø> (ø)
docs/conf.py	100.00% <100.00%> (ø)
respy/interface.py	89.47% <100.00%> (ø)
respy/tests/test_parallelization.py	100.00% <100.00%> (ø)

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