Add First Time being a organizer/speaker/sponsor question to CPT

[renintw]

See #888

This PR adds First Time being an organizer/speaker/sponsor question to CPT and prepares CPT stub for form automation in order to allow the WordCamp Counts to retrieve the first_time value.

Screenshots

Sponsor

Speaker

Organizer

How to test the changes in this Pull Request:

1. Go to individual sites.
2. Go to Sponsors/Organizers/Speakers and click on anyone listed there.
3. You'll see the meta box questions as the above screenshots show.

Questions

1. I'm curious if the timing for a volunteer/speaker/sponsor to fill in the first-time volunteer/speaker/sponsor can only be through the initial form that's created on a new website? If a user deletes this initial form, is there another way to retrieve it later?

2. Is the timing to fill in the first-time organizer only through the organizer's block editor page side panel? Is there a need to prepare an organizer stub for form automation?

[iandunn]

I left a few suggestions, but I think this is pretty good overall and heading in the right direction 👍🏻

[renintw]

@iandunn Much appreciated to you answering all my questions and I've learned a lot. I've made some commit updates based on your last round of feedback and went ahead to merge the PR 👍
But you might have missed the two questions that I added to the PR description later. They won't affect this PR, but they are extended questions that I thought of from this issue. It'd be nice if you could shed some light on them.

[iandunn]

Great job 🎉

I'm curious if the timing for a volunteer/speaker/sponsor to fill in the first-time volunteer/speaker/sponsor can only be through the initial form that's created on a new website? If a user deletes this initial form, is there another way to retrieve it later?

There isn't an automated way to recreate the form, they'd need to manually create the form with the same questions and add the wcfd-key custom field. That's why we have the warning that modifying the form can break the automation.

The post types will still have the questions and data, though, so manually created posts could still collect the data.

Is the timing to fill in the first-time organizer only through the organizer's block editor page side panel? Is there a need to prepare an organizer stub for form automation?

It's the same as the other post types, except that we don't have the automation set up yet, and we don't have a Call for Organizers post. That's probably less needed than the others, since organizers are often chosen before the site is created, but there could be some camps that would benefit from it. It's never been a high priority though.