Add Gravito CMP integration

[sippeangelo]

Integration for Gravito CMP. Untested due to GitBook's restrictions on the site:script:inject and site:script:cookies scopes.

[changeset-bot]

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Latest commit: aa9c1bd

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[pkg-pr-new]

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bun add https://pkg.pr.new/GitbookIO/integrations/@gitbook/api@1306

commit: aa9c1bd