convert python examples to Julia notebooks

[rubiop]

Work in progress by @dannys4

[dannys4]

Almost done with these, need to change how they're done since I changed how MapOptions work

[dannys4]

Stochastic Volatility is giving a lot of issues on this. I'm probably going to ensure the rest of the examples work properly, then write a disclaimer at the top of SV to say that it doesn't have expected behavior and write an issue in this repo to correct the behavior.