[PR] Enhancing metadata API to return upsert partition to primary key count map for both controller and server APIs [pinot]

[via GitHub]

9aman opened a new pull request, #12334:
URL: https://github.com/apache/pinot/pull/12334

   ## Scope of the PR
   Enhance **server and controller API** to return **partition to primary key 
count** for realtime tables that have **upsert** enabled:
   1. Server API: returns the map for all the partitions hosted by the instance.
   2. Controller API: returns the map for the table.
   
   ## Testing
   The changes were tested locally by invoking the **server endpoint** followed 
by **controller endpoint** to test that there is no duplication in counting 
PK's. The replication of segments across servers could be a potential reason 
for duplication, but the controller API has taken care of it.
   
   - Server responses: 
   ```
   {
       "tableName": "upsertMeetupRsvp_REALTIME",
       "diskSizeInBytes": 0,
       "numSegments": 1,
       "numRows": 0,
       "columnLengthMap": {},
       "columnCardinalityMap": {},
       "maxNumMultiValuesMap": {},
       "columnIndexSizeMap": {},
       "upsertPartitionToPrimaryKeyCountMap": {
           "0": 48
       }
   },
   
   
   {
       "tableName": "upsertMeetupRsvp_REALTIME",
       "diskSizeInBytes": 0,
       "numSegments": 1,
       "numRows": 0,
       "columnLengthMap": {},
       "columnCardinalityMap": {},
       "maxNumMultiValuesMap": {},
       "columnIndexSizeMap": {},
       "upsertPartitionToPrimaryKeyCountMap": {
           "1": 45
       }
   }
   ```
   
   - Controller response
   
   ```
   {
           "tableName": "upsertMeetupRsvp_REALTIME",
           "diskSizeInBytes": 0,
           "numSegments": 2,
           "numRows": 0,
           "columnLengthMap": {},
           "columnCardinalityMap": {},
           "maxNumMultiValuesMap": {},
           "columnIndexSizeMap": {},
           "upsertPartitionToPrimaryKeyCountMap": {
             "0": 48,
             "1": 45
           }
   }
   
   ```


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