idea: [DownloadEvent] Adding event queue to process event asynchronously

[namchuai]

Problem Statement

If we write a simple callback, the thread of event emitter will have to wait for the event listener to finished consuming events. This might cause hang.

Feature Idea

Using eventpp package to have an EventQueue which acts as a buffer in between EventEmitter and EventListener

[namchuai]

PR merged, closed!

[gabrielle-ong]

QAing in overall #1242, marking as complete