Automatic transmission MATLAB/Simulink example

[mossr]

This PR adds the automatic transmission (AT) Simulink example and the random search solver.

[codecov-commenter]

Codecov Report

Merging #39 into master will decrease coverage by 7.01%. The diff coverage is 15.17%.

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
- Coverage   90.07%   83.06%   -7.02%     
==========================================
  Files          53       58       +5     
  Lines        3154     3490     +336     
  Branches      379      434      +55     
==========================================
+ Hits         2841     2899      +58     
- Misses        197      476     +279     
+ Partials      116      115       -1     

Impacted Files	Coverage Δ
src/ast_toolbox/simulators/example_at_simulator.py	2.15% <2.15%> (ø)
src/ast_toolbox/algos/random_search.py	17.30% <17.30%> (ø)
src/ast_toolbox/rewards/example_at_reward.py	26.66% <26.66%> (ø)
src/ast_toolbox/spaces/example_at_spaces.py	29.16% <29.16%> (ø)
src/ast_toolbox/policies/random_policy.py	37.25% <37.25%> (ø)
src/ast_toolbox/algos/__init__.py	90.00% <100.00%> (+1.11%)	:arrow_up:
src/ast_toolbox/policies/__init__.py	100.00% <100.00%> (ø)
src/ast_toolbox/rewards/__init__.py	100.00% <100.00%> (ø)
src/ast_toolbox/simulators/__init__.py	100.00% <100.00%> (ø)
src/ast_toolbox/spaces/__init__.py	100.00% <100.00%> (ø)
... and 6 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 24882e4...ec74e50. Read the comment docs.

[mark-koren]

@mossr Can you add unit testing to bring the codecov up to 90%? Also docstrings to whatever files you are adding. Check out the contributions guide for more information