Add support for TikTok video Embeds

[audrasjb]

Description

Fixes #19342

This Pull Request adds TikTok oEmbed support.
For reference, see the related Trac ticket for WP 5.4: https://core.trac.wordpress.org/ticket/49083

How has this been tested?

Copy this test URL into the editor: https://www.tiktok.com/@scout2015/video/6718335390845095173

For reference:
TikTok oEmbed developer documentation: https://developers.tiktok.com/doc/Embed

Screenshots

Types of changes

New feature (non-breaking change which adds functionality)
Introduce a oEmbed block support for a new resource: TikTok.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.

[audrasjb]

Fixes: #19342

[mkaz]

Did not work for me.

Steps:

1. Applied the patch, built Gutenberg
2. Confirmed TikTok embed shows in block library
3. Insert TikTok block and paste link: https://www.tiktok.com/@scout2015/video/6718335390845095173

In console:

Received HTML:

 index.js:287:17
Received plain text:

 https://www.tiktok.com/@scout2015/video/6718335390845095173 index.js:288:17
Processed HTML piece:

 <p>https://www.tiktok.com/@scout2015/video/6718335390845095173</p>

I confirmed other embeds work by embedding a YouTube video with no problems.

[jblz]

@mkaz -- I think this needs the core patch in https://core.trac.wordpress.org/ticket/49083 to work since it leverages the core embed block functionality.

[audrasjb]

Ah yes sorry @mkaz I forgot to mention it has to be tested with the core patch. Thanks @jblz !

[peterwilsoncc]

I’m happy for the core ticket to go in to the WordPress 5.4 or 5.5 release.

If committed to 5.4 does that leave enough time for the editor changes to be committed too or do you need a little more time?

[audrasjb]

Hi there,
For information, my patch was merged in WordPress Core for 5.4: https://core.trac.wordpress.org/ticket/49083.

[jorgefilipecosta]

Works well in my tests after the patch was committed 👍