Elixir support

[setop]

I don't know how much effort it cost to support a new language.
But I'm working on a large Elixir code base and I would love to be able to Grit to refactor it reliably.

[morgante]

Thanks for your interest! We currently prioritize languages for our commercial customers, but if you'd like to take on adding this yourself the process is described here: https://github.com/getgrit/gritql/blob/main/CONTRIBUTING.md#adding-a-new-target-language