[docs] add two-stage stochastic program tutorial

[odow]

I'm giving a few tutorials in October at https://cermics-lab.enpc.fr/seso2023/ and https://julia-users-paris.github.io/workshop/en/.

My plan is to work through a few of these examples, with little exercises at the bottom for people to try. I think it makes sense to add these to the JuMP documentation.

x-ref #3459

Preview: https://jump.dev/JuMP.jl/previews/PR3466/tutorials/applications/two_stage_stochastic

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (da06e53) 98.00% compared to head (f243cb0) 98.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3466   +/-   ##
=======================================
  Coverage   98.00%   98.00%           
=======================================
  Files          36       36           
  Lines        5069     5069           
=======================================
  Hits         4968     4968           
  Misses        101      101           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.