redis_streams: support for XAUTOCLAIM

[ryanschneider]

Context: https://redis.io/docs/latest/develop/data-types/streams/#recovering-from-permanent-failures

My understanding is that the best way to deal with permanent failures in redis stream processing is to now periodically call XAUTOCLAIM to grab any messages that are still showing up in the PEL past a certain reason time (e.g. 1h).

input:
  redis_streams:
    url: TODO
    body_key: body
    streams: [mystream"]
    auto_replay_nacks: true
    limit: 1
    client_id: ${CONSUMER_NAME}
    consumer_group: ${CONSUMER_GROUP}
    start_from_oldest: true
    autoclaim:
      count: 10
      every: 5m
      after: 1h

If we added an autoclaim stanza with every and after fields, we could periodically run XAUTOCLAIM inside read: https://github.com/redpanda-data/connect/blob/main/internal/impl/redis/input_streams.go#L286

For example, the above autoclaim stanza would run XAUTOCLAIM mystream $CONSUMER_GROUP $CONSUMER_NAME 3600 0-0 COUNT 10 every 5m. Note that XAUTOCLAIM actually returns the claimed entries, so these would need to be added to r.pendingMsgs as well.

Probably the easiest way to test this new behavior would be to add an integration test that purposefully doesn't ack every other message, then use a short autoclaim period like every 10s after 30s and monitor that XINFO GROUPS $CONSUMER_GROUP continues to progress.