Feature: Build feature to automatically download arrayfire binaries about arrayfire-rust HOT 2 OPEN

Bump. I thought about adding my own build.rs to my project for the arrayfire dependency, but it should really be at this crate's level

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@philpax @cavemanloverboy

I totally agree that it would be less work for the user if ArrayFire is made available automatically. Realistically, #192 is however is not going happen anytime soon - especially so until CUDA backend of ArrayFire comes down in it's binary size.

Downloading it is perhaps the only viable option at the moment, but this has to be done via user consent. I think providing another rust script (OS agnostic) to download and install ArrayFire to the user's home folder is better route instead of complicating the build.rs with logic to attempt download. I am fine if build.rs can take command line arguments which can be equivalent of explicit action by user but I don't think it can.

If you have any other better ideas, please please do share.

Thanks for bringing this up!

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