objects_and_object_constructors.md: added section to bridge prototypes and classes

[lifrank1]

Because

This change will connect concepts better for learners with other language experience

This PR

Adds a section in the objects and object constructors module to connect the prototypes concepts to classes which may be a familiar subject for better learning.

Issue

Additional Information

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• The Because section summarizes the reason for this PR
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[mao-sz]

Thanks for the PR. I don't feel like this message is necessary, at least not in this lesson (and it's essentially already in the Classes lesson where it'd be more appropriate).

This lesson is purposely not mentioning class syntax, because more often than not when people try to bring JS class syntax into here, they get more confused. As in from what I've seen in the community, it's easier for people with prior experience in other langs to grasp this when they see it as a separate thing to classes, and mentioning that it's similar/related to classes actually makes it more confusing from what I've seen.