Add image asset embedded property

[beve]

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (yarn build) was run locally and any changes were pushed
• Lint (yarn lint) has passed locally and any fixes were made for failures

Pull request type

• Bugfix

What is the current behavior?

Image asset can't be described as embedded, so player try to load them remotely, even if they are embedded as assets.

Issue Number: #21

What is the new behavior?

Player displays correctly the embedded images.

Does this introduce a breaking change?

• Yes
• No

[changeset-bot]

⚠️ No Changeset found

Latest commit: 14f8680

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[github-actions]

This rull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.