Add a basic oEmbedProvider for LottieFiles animations

[marcemarc]

Prerequisites

• I have added steps to test this contribution in the description below

If there's an existing issue for this PR then this fixes

Description

LottieFiles (https://lottiefiles.com/) - The popular opensource JSON-based animation file format that enables designers to ship animations on any platform, has just started supporting OEmbed, from their gallery of community animations, which makes it a lovely candidate for adding an OEmbedProvider to Umbraco's Embed functionality for LottieFiles.

I was going to create a package for this but then it would be called Our.Umbraco.Lottie and I think that would be confusing for people, as they consider Our Umbraco Lottie to be @LottePitcher ... so I think therefore it MUST go in the core.

How to test?

Visit the LottieFiles gallery of 'free animations'

https://lottiefiles.com/featured

search and find the animation you want to embed, on the right hand side there is a panel of information about the animation, and one of the options is to copy the oEmbedUrl

grab that

Go back into Umbraco, and then inside a grid cell or Rich Text Area, click on the Embed option.

paste in the Oembed Url

Delight at seeing an animation in the embed panel

update your width and height as needs be...

Select and publish your page - your animation will appear!

There is really lots more you can do with LottieFiles, and I'm sure someone will build a package to take advantage of the options, and allow you to upload the JSON into the media section etc, but for the timebeing, adding the oEmbedProvider might help spread the word about it's existence...

This PR just adds a new LottieFiles OEmbedProvider, and adds it to the stack of providers in the Umbraco Builder.

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Thanks for considering this contributing to Umbraco CMS!

[umbrabot]

Hi there @marcemarc, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
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• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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[mikecp]

Hey @marcemarc ,
Thanks a lot for this nice addition of a new oEmbed support 👍🎉
Maybe it can be enhanced to more options as you mentioned, but I think it is certainly a nice first step then😉
And I think that setting the width and height to 100% - when not specified otherwize - is a good compromise, this avoids using the provided height and width on which we have no control (imagine they start to return width of 1024 instead of 300😅 )

So we're all set to merge!