ConfigureFlexFEC03 helper and fec example

examples/play-from-disk-fec/jsfiddle/demo.html

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+<!--
+	SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+	SPDX-License-Identifier: MIT
+-->
+Remote Session Description (Paste offer from Go code here)
+<br/>
+<textarea id="remoteSessionDescription"></textarea>
+<br/>
+<button onclick="window.startSession()">Start Session</button>
+<br/>
+<br/>
+<br/>
+
+Browser Session Description (Copy this to answer.txt file)
+<br/>
+<textarea id="localSessionDescription" readonly="true"></textarea>
+<br/>
+
+<button onclick="window.copySessionDescription()">Copy browser Session Description to clipboard</button>
+
+<br/>
+<br/>
+
+Video
+<br/>
+<div id="remoteVideos"></div> <br />
+
+Logs
+<br/>
+<div id="div"></div>