[GHS] Applying attributes to existing features - media embed

[jacekbogdanski]

📝 Provide detailed reproduction steps (if any)

Due to the complex model structure of the Media Embed feature, it's not possible to easily extend it with additional attributes. We will need to create separate integration for it.

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[Mgsy]

It seems that media embed allows defining different outputs (e.g. coming from external providers like iframely). Basically, we have two output types - semantic and non-semantic.

TODO: Check how the model looks like.

Let's start with small research.

[Reinmar]

Scope after the research:

• Support the configurable oembed element name.
• Tests.
• API docs.

Note: We do not plan to support extending the preview markup (when previewInData is true). Read more in #10108.