Support opening single-collection change stream on a system collection

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    • Fully Compatible
    • Query Execution 2021-04-19, Query Execution 2021-05-03, Query Execution 2021-05-17
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      Add allowToRunOnSystemNS parameter to the aggregate command for creating a change streams cursor. DocumentSourceChangeStream::assertIsLegalSpecification() should be changed to not reject the request when allowToRunOnSystemNS:true is specified.

      Whole-database and whole-cluster change streams must still not see change events on system collections.

              Assignee:
              Mindaugas Malinauskas
              Reporter:
              Max Hirschhorn
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