✨ Add amp-wordpress-embed component

[westonruter]

Previously #18412.

Fixes #18378.

To test the component in the WordPress plugin, use the branch in this PR: ampproject/amp-wp#3465

Todo

• Add support for link message.
• Add support for placeholder.
• Ensure fallback is supported. It should be a blockquote.
• Add support for overflow so that when the resize is rejected, we can show a button.
• Verify placeholder works.
• Figure out the right way to start listening for messages, as listenFor may not be right.
• Do we need to send a secret?
• Add assertions for when invalid messages are sent?

[amp-owners-bot]

Hey @ampproject/wg-caching, these files were changed:

• extensions/amp-wordpress-embed/0.1/test/validator-amp-wordpress-embed.html
• extensions/amp-wordpress-embed/0.1/test/validator-amp-wordpress-embed.out
• extensions/amp-wordpress-embed/validator-amp-wordpress-embed.protoascii

[honeybadgerdontcare]

validation changes look good, just need current year in licenses

[rcebulko]

Please use the JSON format for all new OWNERS files. This will become:

// For an explanation of the OWNERS rules and syntax, see:
// https://github.com/ampproject/amp-github-apps/blob/master/owners/OWNERS.example

{
  rules: [
    {
      owners: [
        { name: "westonruter" },
        { name: "amedina" }
      ]
    }
  ]
}

[rcebulko]

Also, /cc @kristoferbaxter in case he thinks we should add ampproject/wg-ui-and-a11y as an owner

[rcebulko]

Approving OWNERS changes

[honeybadgerdontcare]

validation changes look good

[mrjoro]

Is this PR ready to go in?

[westonruter]

No, still on our radar to finish. Most likely to be picked up toward end of Q3.

[CLAassistant]

)
Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement) before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ westonruter
❌ amedina
_{You have signed the CLA already but the status is still pending? Let us recheck) it.}

[Gregable]

@westonruter is this PR still active?

[westonruter]

No. Now that Bento is underway, it'll need to be rewritten to make use of the new APIs anyway.