Emit errors when request is aborted #778
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While working on #775, we discovered that not every HTTP stack in tus-js-client behaves the same way when aborting requests:
sendhanging, neither resolving nor rejecting it.While the exact error is not important, it's helpful to standardize on throwing some error, as allows for simpler logic when aborting requests. Hence this PR, which implements this. It uses a DOMException since normal Error instances in JavaScript don't have proper error codes. While DOMException is a Web API, I think it's available in most JavaScript runtimes.