fixes #178: implement SSE retry without fetch-event-source #185
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#180 introduced a retry mechanism using the
@microsoft/fetch-event-source
package. However, that package does not seem maintained anymore, and some sporadic message duplication issues occurred while testing the 24.9.0-rc.1 pre-release which seem related to an unmerged PR (Azure/fetch-event-source#7).This PR therefore reimplements the retry logic using the browser's
EventSource
, and removes the dependency onfetch-event-source
.