Batch script parsed events from the debug extension.

[annagrin]

Debugger.ScriptParsed events are sent on loading and parsing scripts into the browser. We can have a few thousands of them at the start of running a flutter app. This can cause a performance problem, especially in scenarios using SSE connection from the debug extension, where the events translate into http POST calls.

Here is where the debug extension is sending all events to dwds:

webdev/dwds/debug_extension/web/background.dart

Line 593 in bfc9050

debugSession.socketClient.sink.add(jsonEncode(serializers.serialize(event)));

We can use batched events similar to what we are doing in the injected client:

webdev/dwds/web/client.dart

Line 68 in bfc9050

var debugEventController =