[SERVER-42676] M/R Agg: Add mapReduce execution statistics for replica set command - MongoDB

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Backwards Compatibility:
Minor Change
Epic Link:
MR in Agg
Sprint:
Query 2019-09-09, Query 2019-09-23, Query 2019-10-07, Query 2019-10-21

depends on

SERVER-42507 Add internal javascript emit aggregation expression

SERVER-42644 M/R Agg: Add $_internalJs expression

SERVER-42694 M/R Agg: Implement $_internalJSReduce (Accumulator)

SERVER-42903 M/R Agg: Enable execution of translated MR pipeline

SERVER-42584 M/R Agg: Put PlanStageStats in aggregation

is depended on by

SERVER-42680 M/R Agg: Generate full pipeline from map reduce command

SERVER-43290 M/R Agg: Add mapReduce execution statistics for cluster command

is documented by

DOCS-13129 Investigate changes in SERVER-42676: M/R Agg: Add mapReduce execution statistics for replica set command

(2 is depended on by, 1 is documented by)