BREAKING CHANGE: `CodeBlockHighlight` was importing the full `lowlight` libraries, including _all_
syntax highlightning definitions from `highlight.js`. The new behavior changes the signature of
`CodeBlockHighlight` to accept an object with all syntax highlightning definitions. This means that
now the user of the library __MUST__ import languages themselves and tiptap will no longer
bundle the full `highlight.js` in itself.
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