ABI-compatible Option and Result types

[pawelrutkaq]

We need an ABI-compatible queue that behaves similarly to std option and std expected, with a defined memory layout for ABI-Compatible Data Types feature request.

Criteria:

• must provide a stable, well-defined memory layout (use [Rust] ABI-compatible Option and Result types baselibs_rust#40 as reference implementation )
• should behave similarly to Option and Result in the std library
• should be easily convertible to and from the standard types