Use Case

Add support for timeoutMS to `explain` commands:

When timeoutMS is specified, drivers MUST provide a way to specify timeoutMS that results in maxTimeMS being set on the explain command

https://github.com/mongodb/specifications/blob/master/source/client-side-operations-timeout/client-side-operations-timeout.md#explain

Users will be able to provide a timeoutMS value for explain specifically.

• `timeoutMS` will not be inherited from the parent command to the child command.
• If both `timeoutMS` and `maxTimeMS` is set, `timeoutMS` takes priority.

User Experience

n/a

Dependencies

n/a

Risks/Unknowns

n/a

Acceptance Criteria

Implementation Requirements

• functional reqs, potential snafus to avoid, performance targets, etc

Testing Requirements

• unit test, spec test sync, etc

Documentation Requirements

• DOCSP ticket, API docs, etc

Follow Up Requirements

• additional tickets to file, required releases, etc
• if node behavior differs/will differ from other drivers, confirm with dbx devs what standard to aim for and what plan, if any, exists to reconcile the diverging behavior moving forward