Roadmap initiative: Portable and interoperable

[nrc]

This issue tracks the steps for setting up a new initiative in the async vision roadmap.
Please read the instructions for owning an initiative.

Top-level goal: #259 Portable across runtimes, easy to switch
Initiative owner: @nrc

Each initiative should have a landing page, linked to from the roadmap: https://github.com/nrc/portable-interoperable

For in-progress initiatives the landing page should include, or have pointers to:

• Goals and impact of the initiative
• Milestones
• Design notes and documentation (this may be sparse in the beginning)
• Links to any organizing tools, such as a project board
• The initiative owner
• The current set of stakeholders and the area(s) they represent
• Notes on how to get involved
• For landing pages not on this website, a link back to the overall roadmap

This issue can be closed when all of the above items are complete.