App Center File Upload Client

This package, `appcenter-file-upload-client`, provides a client-side JavaScript/TypeScript library designed to streamline the file upload process specifically for Microsoft App Center services. It abstracts the complexities of interacting with the Microsoft file upload service, offering a programmatic interface to upload files with progress tracking, cancellation capabilities, and event hooks for messages and state changes. Currently at version 0.1.0, this package is an early-stage release, and given its last commit date in 2018, it is considered abandoned and unlikely to receive further updates or stability guarantees. Its primary differentiator is its direct integration with App Center's internal file upload mechanisms, requiring `assetId`, `assetDomain`, and `assetToken` values obtained from the App Center service itself.