feat: add frameEmbed to publication common metadata

[defispartan]

Add frameEmbed boolean field to publication common metadata to specify whether publication contains Frame link embedded

[height]

Link Height tasks by mentioning a task ID in the pull request title or commit messages, or description and comments with the keyword link (e.g. "Link T-123").

💡Tip: You can also use "Close T-X" to automatically close a task when the pull request is merged.

[cesarenaldi]

I understand the intent here. The idea is that posts that intend to share an embed (like frames) to use the EmbedMetadata specification.