feat: Get AudioSource by path

[te8uekm12]

Description

When we create an AudioSource with using loadFile, loadMem, loadAssets, or loadUrl, we provide a unique path or key.

We can retrieve a collection of loaded AudioSources by calling soLoud.activeSounds, but we cannot fetch a specific AudioSource by its unique path or key.

I think it would be more convenient if we had a method that returns an AudioSource by its path or key, or if this information were added to the AudioSource class.

Currently, I have to maintain a map of path/key to soundHash in order to access a specific AudioSource.

Requirements

• Checklist of requirements to be fulfilled

Additional Context

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