feat: customizable cache key

[johannschopplich]

🔗 Linked issue

#50

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Supersedes #51.

@killjoy1221 Adds support for a custom key to de-duplicate requests, just like asyncData does:

cost route = useRoute()

const { data, pending, error } = await useJsonPlaceholderData<JsonPlaceholderComment>(
  // Key can be reactive
  computed(() => route.params.slug)
  'comments',
  {
    query: computed(() => ({
      postId: `${route.query.postId || 1}`,
    })),
)

📝 Checklist

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

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[mattmess1221]

The useApiData looks good, but I don't think $api needs a dedicated parameter. Adding an optional first argument will just complicate the logic and types.

Since caching is disabled by default, could the cache option be used for that? If set to true, generate a default key. Otherwise it's a string, ref, or getter function usage in toValue()

[johannschopplich]

I like it!

[mattmess1221]

LGTM