Add (partial) support for Virtual Events extension

[justlevine]

This PR adds partial support for Virtual Events extension.

What it includes:

The meta fields from src/Tribe/Models/Event.php: isVirtual virtualUrl virtualEmbedVideo virtualLinkedButton virtualLinkedButtonText virtualShowEmbedAt virtualShowEmbedTo virtualShowLeadUp virtualIsLinkable virtualIsImmediate virtualShouldShowEmbed virtualShouldShowLink

What's not included.

• GQL equivalents of helper functions. I'm working under the assumption that if it isn't saved to the event meta, its beyond the scope of the plugin. Correct me if I'm wrong.
• Meta fields for Zoom (located at src/Tribe/Meetings/Zoom/Event_Meta.php). I don't have access to the Zoom API, so I can't reasonably test it. If you want me to add them in blind, I'm happy to.
• Unit tests. This is beyond my skill-set.

Feedback please.

I chose to stick to the naming that TEC gave its meta fields, even though their naming system isn't self-documenting (e.g. virtualEmbedVideo and virtualLinkedButton are bool, but differ in purpose to virtualShouldShowEmbed and virtualShouldShowLink). Ideally, Id change/merge some of these fields to make them easier for the user. Something like virtualDisplayType: ("embed" | "link") and virtualShouldShow. Thoughts?

[craigwilcox]

Hi @justlevine,

We'll take a look at this as soon as we can. Thanks for your help on it!

[kidunot89]

Agreed, that's why I made this a separate workflow. It was meant to be temporary.

[kidunot89]

Agree, that's why I made this a separate workflow. It was meant to be temporary.

[kidunot89]

@bordoni @justlevine Closed because CI secret are unreadable from PR across forks.