Sync OpenAPI and regenerate: Grand refactor of list handling (#197)

Closes #174

Closes #186

apidiff:
```
Incompatible changes:
- (*Auth).GithubReadTeams: removed
- (*Auth).GithubReadUsers: removed
- (*System).PoliciesList: removed
Compatible changes:
- (*Auth).GithubListTeams: added
- (*Auth).GithubListUsers: added
- (*Secrets).CubbyholeList: added
- (*Secrets).KvV1List: added
- (*Secrets).KvV2ListMetadata: added
- (*System).RawList: added
- (*System).RawListPath: added
```
(and related changes in schema package)