🎉 Source Facebook: add the "videos" stream.

[zestyping]

What

This PR adds the missing "videos" stream to the Facebook Marketing source.

How

The new Videos class is very similar to the existing Ads and Campaigns classes; it is just a simple subclass of FBMarketingIncrementalStream. The schema, defined in videos.json, is based on the Facebook API documentation at https://developers.facebook.com/docs/marketing-api/reference/video and includes all the fields that Facebook would allow.

Pre-merge Checklist

Expand the relevant checklist and delete the others.

Updating a connector

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[CLAassistant]

All committers have signed the CLA.

[marcosmarxm]

@zestyping can you solve the conflicts?

[zestyping]

Okay, I've rebased on master and resolved the merge conflicts.

[marcosmarxm]

thanks @zestyping