[new rule] compacted topics must always be ordered

[BirgitBader]

(i) This issue has been manually transferred from a former internal repository, as a private repository issue cannot be transferred to a public repository.

Context

If a compacted topic is used, it must always be ordered so that the last written data event is the most current for a used key. If a situation might occur in which the last written data event is not the most current for the specified key, the compaction process will delete the most current event.