Devops API swagger

[neottil]

Create swagger file for devops API, like other API.

Discussed in #1621

^{Originally posted by neottil April 19, 2023}
In documentation there is a section that describe devops http api: https://www.eclipse.org/ditto/installation-operating.html#retrieve-all-log-levels.
Is there a swagger file for this, like other api exposed by swagger module?
Like this: https://github.com/eclipse-ditto/ditto/blob/master/documentation/src/main/resources/openapi/ditto-api-2.yml