Support IE11 by adding a polyfill for the EventSource API

[feross]

One of our paying enterprise customers requires that we support Internet Explorer 11 (IE11). Right now, the only API we're using that does not work on IE11 is the EventSource API.

This PR add a polyfill for the EventSource API so that our web app will work on browsers that are missing this API. We use the event-source-polyfill package to implement the polyfill.

This package has 516,742 weekly downloads so it should be reliable and safe.

[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert (click for details)
Warn		[email protected] is Protestware or potentially unwanted behavior. Note: This package geolocates users based on their IP address and if the user is Russia-based prints a political protest message in the browser 15 seconds after the package is loaded. The package then tries to redirect the browser to another site using the window.open() function. Source: package-lock.json Source: package.json ℹ Read more on: This package | This alert | What is protestware? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at [email protected]. Suggestion: Consider that consuming this package may come along with functionality unrelated to its primary purpose. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/[email protected]. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	event-source-polyfill@​1.0.26

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