✨ Add support for disabling the separation of input and output JSON Schemas in OpenAPI with Pydantic v2 (#10145)
* 📝 Add docs for Separate OpenAPI Schemas for Input and Output
* 🔧 Add new docs page to MkDocs config
* ✨ Add separate_input_output_schemas parameter to FastAPI class
* 📝 Add source examples for separating OpenAPI schemas
* ✅ Add tests for separated OpenAPI schemas
* 📝 Add source examples for Python 3.10, 3.9, and 3.7+
* 📝 Update docs for Separate OpenAPI Schemas with new multi-version examples
* ✅ Add and update tests for different Python versions
* ✅ Add tests for corner cases with separate_input_output_schemas
* 📝 Update tutorial to use Union instead of Optional
* 🐛 Fix type annotations
* 🐛 Fix correct import in test
* 💄 Add CSS to simulate browser windows for screenshots
* ➕ Add playwright as a dev dependency to automate generating screenshots
* 🔨 Add Playwright scripts to generate screenshots for new docs
* 📝 Update docs, tweak text to match screenshots
* 🍱 Add screenshots for new docs
