Add video panel support

[yileifeng]

Closes #359

Worked on with @JahidAhmed

Added video functionality for basic panels as found in the demo product. Most of the options are already configurable. There are a list of remaining tasks that I wrote as a comment in video-panel but can also list here:

• [x] videos are not working as part of dynamic panels, as seen in the second panel on demo page
• [x] add support for video dimensions + fix the current panel taking up unnecessary space (needs to be fixed even if no dimensions are specified)
• [x] add full screen functionality (not sure how high a priority this is but we have a vue-fullscreen component for images already)
• [x] tied together with the video dimensions, ensure nothing breaks on mobile after fixing point 2
• [x] test to make sure transcript and local video files are working

The first two points here are definitely the highest priority.

Testing:

• video controls accessibility
• working captions
• transcripts embedded below video if included in config
• general working functionality

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This change is 

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Your demo site is ready! 🚀 Visit it here: https://ramp4-pcar4.github.io/story-ramp/video-panel-support/#/en/00000000-0000-0000-0000-000000000000