feat(query): support complex SQL where conditions

[farnabaz]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Introduce orWhere and andWhere query functions to create complex where conditions

queryCollection('docs')
    .where('extension', '=', 'md')
    .or(group => group
      .where('navigation', '<>', 'false')
      .where('navigation', 'IS NULL'),
    )

Result will be:
select * from _content_docs where extension = 'md' AND (navigation <> 'false' OR navigation IS NULL)

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/content@2878

commit: 0acfe83