Create a document source aggregation stage $backupCursor that calls into BackupCursorService::openBackupCursor. The companion closeBackupCursor method should be called when the query level cursor is killed via killCursors or the cursor manager times out the cursor.
This aggregation cursor should be tailable and return a document for each file to copy:
{filename: "<filename>"}
This ticket should not add auth rules nor the replication metadata document describing the checkpoint timestamp and oplog range in the checkpoint.
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SERVER-36266 Add auth rules for $backupCursor aggregation stage
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