[Discussion] Ideas for new Concepts

### Concept Roadmap
There are already a lot of ideas for additional concepts that we could cover with concept exercises in the future.
You can find a list in our roadmap document: **[Roadmap - Potential Future Concepts](https://exercism.org/docs/tracks/go/roadmap#h-potential-future-concepts)**

We already created issues for the following new concepts:
- [x] https://github.com/exercism/go/issues/2037
- [x] https://github.com/exercism/go/issues/2038
- [ ] https://github.com/exercism/go/issues/1391
- [ ] https://github.com/exercism/go/issues/1373 (claimed)
- [x] https://github.com/exercism/go/issues/1989
- [ ] https://github.com/exercism/go/issues/1997
- [ ] https://github.com/exercism/go/issues/1998
- [ ] https://github.com/exercism/go/issues/2185
- [x] https://github.com/exercism/go/issues/2184
- [ ] https://github.com/exercism/go/issues/2183
- [ ] https://github.com/exercism/go/issues/2182
- [ ] https://github.com/exercism/go/issues/2226

Additionally some concept exercises that exist but need major improvements are not yet visible on the website (status "wip").

### Purpose of this issue
- Suggest additional concepts to cover that are not on the [roadmap](https://exercism.org/docs/tracks/go/roadmap#h-syllabus-overview) yet.
- Comment on which concept from the roadmap you would like to see implemented first.
- Volunteer for creating a certain concept exercise that does not have an issue yet, so a maintainer can write up an issue with some basic guidelines for you.
- General discussion about how to divide concepts/ how to structure the concept tree.
- etc