Update the Python binding for new refresh and optimize APIs

[apoorvedave1]

Can you or @thrajput also update the Python binding?

@AFFogarty can help on the C# side once 0.3 is released. (I will ping you @AFFogarty 😄 when it's ready)

Originally posted by @imback82 in #187 (comment)

[imback82]

We need Python binding for optimize as well: #166