Audio Object URL as Array

[danpastori]

Discussed in #496

^{Originally posted by danpastori May 4, 2022}

👉 Describe the problem

Instead of providing an individual URL for an audio file, allow for the url key to be an array or a single url. This will allow us to define fallback URLs for MP3 or WAV and possibly future formats.

👥 Problem evidence & reach

Anyone who has fallback URLs

🥰 Describe the "impact" on users?

Ability to set fallback URLs will allow for multiple file types to be set up for an audio object.

🏆 How to solve this problem

When initializing AmplitudeJS, audio objects can contain an array of audio files.

💯 How do we validate the problem is solved?

Fallback URLs are supported