Enable multipart/form-data POST Request Monitoring with Binary File Upload (e.g., Audio/Image)

### Problem Statement #### Description of the Problem: Our API endpoints commonly accept HTTP POST requests formatted as multipart/form-data, which include binary file uploads (e.g., .wav audio files, images). Current Uptime Monitor capabilities appear to be limited to text-based request bodies (like JSON or simple key-value pairs), or they have strict overall size limits (e.g., 1000 bytes) that make it impossible to include even a minimal binary file for testing. This limitation prevents us from performing comprehensive end-to-end uptime monitoring of our critical API functionalities that rely on file uploads. We cannot truly verify if our file upload mechanisms are working correctly without actually sending a representative binary payload. #### How This Would Help Our Workflow: Implementing this feature would significantly improve our ability to: - Ensure End-to-End API Health: Beyond just checking if the server is up, we can verify that the critical file upload pipeline of our API is functional and responsive. This is crucial for applications that depend heavily on receiving and processing user-uploaded content. - Catch Failures Earlier: Issues with file parsing, storage, or processing on the server-side that might not be caught by a simple JSON or GET request health check would be identified immediately. - Reduce False Negatives/Positives: Avoid relying solely on simpler health checks that might pass even if the core file upload functionality is broken. - Streamline Monitoring Stack: Consolidate monitoring efforts within a single platform, rather than needing custom scripts or external synthetic monitoring tools for this specific use case. This feature would be invaluable for modern web services that handle user-generated content and binary data uploads. We believe it would greatly enhance the utility of your Uptime Monitor for a wide range of users. ### Solution Brainstorm #### Proposed Solution / Desired Feature: We request the ability to configure Uptime Moni…