feat: export transformers

[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

Simple usage

import { transformContent } from '@nuxt/content/transformers'

const parsed = await transformContent(
    'content:index.md',
    [
        '# Nuxt.js',
        '',
        '```ts',
        'console.log("Hello world!")',
        '```'
    ].join('\n')
)

Shiki transformer

import { transformContent } from '@nuxt/content/transformers'
import shiki from '@nuxt/content/transformers/shiki'

// For using the internal Shiki transformer we need to expose the global `$fetch` function
// which will be used by Shiki transformer to call highlight API
// See: https://github.com/nuxt/content/blob/main/src/runtime/server/api/highlight.ts
//
// Alternatively, you can create a custom transformer for Shiki and use that instead of the internal one
global.$fetch = () => ({})

const parsed = await transformContent(
    'content:index.md',
    [
        '# Nuxt.js',
        '',
        '```ts',
        'console.log("Hello world!")',
        '```'
    ].join('\n'),
    {
        transformers: [shiki]
    }
)

Custom transformer

import { transformContent, defineTransformer } from '@nuxt/content/transformers'

const myTransformer = defineTransformer({
    name: 'my-transformer',
    extensions: ['.*'],
    transform(parsedContent, options) {
        // Do magic here
    }
})

const parsed = await transformContent(
    'content:index.md',
    [
        '# Nuxt.js',
        '',
        '```ts',
        'console.log("Hello world!")',
        '```'
    ].join('\n'),
    {
        transformers: [myTransformer],
        myTransformer: {
            // options for my-transformer
        }
    }
)

📝 Checklist

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

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