Add Cython support to speed up arrow.get

[jadchaar]

We had a PR in 2017 that addressed this issue (#414), but it was never merged in, and the Cython implementation has since gotten outdated. It would be great if someone could take on this issue.

[mashfy13]

I'm interested in helping out with the Cython implementation. I will definitely take a look at it!

[mashfy13]

Is there any way to optimize the *args and **kwargs lists using Cython? I've been considering how to approach this but it seems like it would be pretty difficult since these lists can have different types based on what is getting passed to the function. I am currently thinking that these two lists would have to remain in their Python implementation.

[jadchaar]

Hi @mashfy13, I am not too familiar with Cython myself, but we created this issue since the old PR became stale after a lack of review: #414. You can refer to the PR for a bit of inspiration. It may be best to focus the Cython optimizations on the parsing elements of Arrow since this may be used most often and in bulk.

I wish I could be of more help, but I have not gotten around to learning the ins and outs of Cython yet.