Templatize A Prompt

Templatize a prompt by identifying and extracting variables. This API analyzes a prompt and converts specific values into reusable template variables with placeholders. **Requirements:** - Must have joined the closed research preview for prompt tools APIs - Must use the API directly (not available in SDK) - Must include the beta header `prompt-tools-2025-04-02` - Messages must contain only text-only content blocks - No tool calls, images, or prompt caching blocks allowed - Only contiguous us...