mostjs/x-xhr

@most/xhr is an experimental library that allows making XMLHttpRequests using the @most/core reactive programming library. It provides a `request` function that takes a setup function for creating and configuring an XMLHttpRequest, and returns a Stream that emits a single ProgressEvent for the request's `load`, `error`, or `timeout` event. This library is intended for developers using @most/core who want to integrate XHR requests into their reactive data flows while maintaining control over error handling and request setup.