feat: playground sample dataset import

[parion]

❓ Type of change

• [x] 📖 Documentation (updates to the documentation or readme)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality)
• [x] ✨ 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

Allows import of a sample dataset into a Sanity Content Lake dataset, setting developers up quickly with their own instance of playground data. Heavily inspired by sanity-template-nuxt-clean.

Note: Speaking of, this could be another opportunity to use another external package in the form of Sanity's sanity-template-nuxt-clean to replace playground.

✅ To-Do's

• [ ] For maintainer(s): Please replace /playground/cms/sample-data.tar.gz with the exported data result of running the Sanity export CLI command against the name of the current playground dataset for project ID j1o4tmjp.
• [ ] Replace the hardcoded dataset value with an environment variable while making any other hardcoded/env value updates.

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