[🚀esl-utils]: Proposal: getEventListeners() method for SynteticEventTarget

[ala-n]

As an ESL consumer, I want to have a more understandable check for a listener's count than this.hasEventListener(type, min)

Proposal:
Add getEventListeners method with the following signature:

   protected getEventListeners(): EventListener[]; // Returns all event listeners of the SyntetycEvent target
   protected getEventListeners(type: string): EventListener[]; // Returns all event listeners of the SyntetycEvent target that handles passed event type

NTH: reuse method inside hasEventListener()
Deprecate: numeric and second parm for hasEventListener()

Internal code update and deprecation suggestion:
this.hasEventListener(event, 1) => this.getEventListeners(event).length > 1

[ala-n]

🎉 This issue has been resolved in version 4.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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