Preserve field order in $merge

Filed on behalf of https://jira.mongodb.org/browse/SERVER-63853: A variety of formats require strict adherence to the sequence of fields, such as bioinformatics Files of such formats are often very large and contain nested structures, so it is convenient to use them as collections. But to keep the data belonging to the above specs, it is necessary to keep the arrangement of the fields. Unfortunately, aggregations with saving results to another DB lose original arrangement.

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Preserve field order in $merge