docs: update roadmap

[braindigitalis]

We hadn't updated this and coro is essentially stable now.
Added new roadmap features.
For discussion: is this page best place to store a roadmap, it isn't very community driven.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[Jaskowicz1]

I think this is fine, we just need something to remind us of the Roadmap (maybe a discord bot to ping in Library-Development?)

[braindigitalis]

I think this is fine, we just need something to remind us of the Roadmap (maybe a discord bot to ping in Library-Development?)

sounds good!