Serialize codegroup attributes

Now you can pass props to codegroups and they will be serialized to HAST syntax tree. For example:

:::codegroup{id="language-selector"}
:::

:::codegroup{id="pkg-selector"}
:::

Commits

• feat: serialize codegroup attributes 46438d7
• chore: update dependencies 99c574e

Full Changelog: v7.0.1...v7.0.2