Provide a way to pull in Wit files from OCI

[jsturtevant]

There is work happening to pull the wit files form oci instead of copy and pasting the files into the local project.

There should be a way to pull those files form oci and then run wit-bindgen against those files

see: WebAssembly/WASI#606

[jsturtevant]

cargo component example: bytecodealliance/cargo-component#322