Import Media: Integrate external media modal

[arthur791004]

Related to https://github.com/Automattic/dotcom-forge/issues/10251, #41078

Proposed changes:

• Integrate external media modal

TODO

• Fix CSS
• Fix ERR_BLOCKED_BY_RESPONSE.NotSameOrigin for Openverse (It's resolved automatically...)
• Display success notice
• Move to Jetpack and enable it for WP.com users first

The current screenshot

Google Photo	Pexels free photos	Openverse

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

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[github-actions]

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[arthur791004]

Closing it in favor of #41078 since we plan to move all of the external media codebase to the new package.