meteor: add methods to Mongo.ObjectID
meteor: add methods to Mongo.ObjectID

These method are accessible from meteor Mongo.ObjectID but missing.

Per https://docs.meteor.com/api/collections.html#Mongo-ObjectID :
"Mongo.ObjectID follows the same API as the Node MongoDB driver ObjectID class"

When I check the Node.js MongoDB Driver API, only these two methods
are interesting. (getTimestamp()  doesn't make sense in Meteor).

I've a test that call both methods successfully.

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