Add dynamicFilterSplitsProcessed to OperatorStats

[raunaqmorarka]

Exposing how many splits were processed with dynamic filter in table scan via OperatorContext and OperatorStats. (#3005)
E.g.:

{
      "stageId" : 1,
      "pipelineId" : 2,
      "operatorId" : 0,
      "planNodeId" : "355",
      "operatorType" : "ScanFilterAndProjectOperator",
      "totalDrivers" : 2002,
      "addInputCalls" : 662561,
      "addInputWall" : "11.32m",
      "addInputCpu" : "0.00ns",
      "physicalInputDataSize" : "48148296B",
      "physicalInputPositions" : 661815000,
      "internalNetworkInputDataSize" : "0B",
      "internalNetworkInputPositions" : 0,
      "rawInputDataSize" : "48148296B",
      "inputDataSize" : "3309072490B",
      "inputPositions" : 661815000,
      "sumSquaredInputPositions" : 1.023537125E15,
      "getOutputCalls" : 665179,
      "getOutputWall" : "21.65m",
      "getOutputCpu" : "24.25s",
      "outputDataSize" : "9265405160B",
      "outputPositions" : 661815000,
      "physicalWrittenDataSize" : "0B",
      "blockedWall" : "0.00ns",
      "finishCalls" : 0,
      "finishWall" : "0.00ns",
      "finishCpu" : "0.00ns",
      "userMemoryReservation" : "0B",
      "revocableMemoryReservation" : "0B",
      "systemMemoryReservation" : "0B",
      "peakUserMemoryReservation" : "0B",
      "peakSystemMemoryReservation" : "40278B",
      "peakRevocableMemoryReservation" : "0B",
      "peakTotalMemoryReservation" : "40278B",
      "spilledDataSize" : "0B",
      "dynamicFilterSplitsProcessed" : 2002
}

[sopel39]

merged, thanks!