Add Volume rate to Audio Service

[mohammadne]

a method to set the volume and a getter to get the rate

[ryanheise]

Hi @mohammadne , can you help me to understand your use case further? Normally, the volume is not an on-screen control, but rather is a button on the side of the phone rather than being handled as part of the app's logic. Do you actually use this?

[mohammadne]

if you decide to implement equalizer and change the audio frequency, then this item should be implemented in UI.

also in many new designs, this feature is implemented.

Thanks @ryanheise

[ryanheise]

Setting volume the normal way is a much more common use case so I think I'm fine with leaving this one as a custom action.

[github-actions]

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