This PR is part of the work to support multi-datadir for Pinot server as tracked by #8843.

Following up on #9306, this one adds the controller side periodic task SegmentTierAssigner to calculate the target tier for segment and set it in SegmentZKMetadata, as goal state to guide servers to put segments into the right datadir (i.e. tier).

The next PR will connect the two parts, i.e. reusing SegmentReloadMessage to notify servers to do the migration.

Release Note

New configs to turn on tier assigner:

1. controller.segmentTierAssigner.frequencyPeriod: -1 by default, disabled
2. controller.segmentTierAssigner.initialDelayInSeconds: 120s-300s w/ jitter by default

Extended API to query segment tiers

e.g. curl -X GET "http://localhost:9000/segments/airlineStats_OFFLINE/tiers?type=OFFLINE" -H "accept: application/json"
{
  "tableName": "airlineStats_OFFLINE",
  "segmentTiers": {
    "airlineStats_OFFLINE_16071_16071_0": {
      "targetTier": "coldTier",
      "Server_192.168.0.104_7000": "coldTier"
    },
    "airlineStats_OFFLINE_16072_16072_0": {
      "targetTier": "coldTier",
      "Server_192.168.0.104_7000": "coldTier"
    },
...