✨ Add support for disabling the separation of input and output JSON Schemas in OpenAP...

✨ 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