Support Topic ID's

[chris-giblin]

Kafka 2.8 introduced Topic ID's (KIP 516). Since Kafka 3.1.0, FETCH requests use topic IDs instead of topic names.

The current implementation of topic encryption uses string-matching to identify topic partitions in Kafka messages. This needs to be extended to recognize topics based on topic ID.

This presumably means:

1. Message handling must recognize both topic names and topic id's.
2. The topic encryption service must maintain topic metadata for all topics in order to efficiently map topic id's to names.
3. Encryption policy could be specified with topic names or IDs.