Add missing endpoints to OpenAPI documentetion

### Proposal:

At the dev call on Jun 13th, 2024 we decided to add missing endpoints to our OpenAPI documentation. Cause now there are only methods that we need to generate our SDKs. A huge of methods realized by Buddy extension are not represented there. We need to improve it

### Checklist:

^{To be completed by the assignee. Check off tasks that have been completed or are not applicable.}

- [ ] Implementation completed
- [ ] Tests developed
- [ ] Documentation updated
- [ ] Documentation reviewed
- [ ] Changelog updated
- [ ] OpenAPI YAML updated and issue created to rebuild clients