[Fabric] Enable implementation of custom events on custom components #13635
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Description
Enable custom components to raise events.
What
Implement a public EventEmitter class, which can be used to raise events on a component.
Add a builder method to set a updateEventEmitter handler to allow access to the event emitter to custom components.
Removed some unused methods on ComponentView.
Made some trivial methods on ComponentView noexcept.
Added example usage of custom events in playground app.
Microsoft Reviewers: Open in CodeFlow