add SegmentTierAssigner and refine restful APIs to get segment tier info

[klsince]

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"
    },
...

[codecov-commenter]

Codecov Report

Merging #9598 (4824266) into master (d396b97) will increase coverage by 44.04%.
The diff coverage is 58.57%.

@@              Coverage Diff              @@
##             master    #9598       +/-   ##
=============================================
+ Coverage     25.84%   69.89%   +44.04%     
- Complexity       44     4977     +4933     
=============================================
  Files          1926     1939       +13     
  Lines        103305   103725      +420     
  Branches      15688    15739       +51     
=============================================
+ Hits          26702    72497    +45795     
+ Misses        73903    26119    -47784     
- Partials       2700     5109     +2409     

Flag	Coverage Δ
integration1	25.81% <15.71%> (-0.04%)	⬇️
integration2	24.51% <15.71%> (?)
unittests1	67.30% <ø> (?)
unittests2	15.60% <58.57%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ler/helix/core/relocation/SegmentTierAssigner.java	46.66% <46.66%> (ø)
.../apache/pinot/controller/util/TableTierReader.java	88.46% <70.58%> (+88.46%)	⬆️
...apache/pinot/controller/BaseControllerStarter.java	82.42% <100.00%> (+6.50%)	⬆️
...va/org/apache/pinot/controller/ControllerConf.java	57.95% <100.00%> (+8.91%)	⬆️
...e/pinot/controller/util/ServerTableTierReader.java	85.29% <100.00%> (+85.29%)	⬆️
...data/manager/realtime/DefaultSegmentCommitter.java	0.00% <0.00%> (-80.00%)	⬇️
...er/api/resources/LLCSegmentCompletionHandlers.java	43.56% <0.00%> (-18.82%)	⬇️
...altime/ServerSegmentCompletionProtocolHandler.java	51.88% <0.00%> (-6.61%)	⬇️
...core/startree/operator/StarTreeFilterOperator.java	86.61% <0.00%> (-1.41%)	⬇️
...pache/pinot/core/query/utils/idset/EmptyIdSet.java	25.00% <0.00%> (ø)
... and 1402 more

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[npawar]

please also add an example to the PR description, regarding the changes expected to the the API response

[npawar]

lgtm!