Implement more examples with optimization test problems

[mrakitin]

A few useful resources:

• https://en.wikipedia.org/wiki/Test_functions_for_optimization
• https://www.sfu.ca/~ssurjano/optimization.html (47 test functions are listed there)
• https://arxiv.org/pdf/1308.4008v1 (a literature survey article with more functions)
• https://www-optima.amp.i.kyoto-u.ac.jp/member/student/hedar/Hedar_files/TestGO.htm
• https://infinity77.net/global_optimization/test_functions.html#multidimensional-test-functions-index

[thopkins32]

We can include these in the docs, but let's make sure that they have added value and don't simply duplicate what already exists here: https://github.com/bluesky/blop/blob/main/docs/source/tutorials/simple-experiment.md

An example of this is if the test problem is difficult enough to warrant using more complex Ax features, we can show how to do that in a tutorial.