MVP Rust port for Metacall

[swarnimarun]

This issue is to list out things that may or may not have been completed in order to get rs-port working.

• Add the cargo based rs-port project. // TODO: Will PR it when I can get cmake build working
• Use cmakeRust(might need some modifications) for the cmake build system integration.
• Setup cmake for the Rust project.

At the moment I haven't pushed the code because I haven't been able to get cmake working with any of it, but I just uploaded my source on metacall-rs-port.

cc: @viferga

[viferga]

I will try to add a placeholder for your project, and merge it into master.