[Dev] Turnpike tutorial

[ocots]

Add a tutorial on the turnpike property.¹

• See this paper and reproduce simulations that can be found here.
• Reproduce this example and give mathematical insights.
• See also these microbial example.
• Turnpike Property in Optimal Microbial Metabolite Production

Footnotes

1. E. Trélat, E. Zuazua, The turnpike property in finite-dimensional nonlinear optimal control, J. Differential Equations, 258 (2015), no. 1, pp 81–114. ↩