Add configurable ads volume control feature

[vivektiwari1986]

This PR introduces a new configuration option that allows users to set a specific volume level for YouTube ads instead of only having the option to completely mute them. Addresses #344

User Experience

1. Users who don't want to completely silence ads can now set them to a lower volume (e.g., 30%)
2. Clear prompts guide users through the configuration process
3. Seamless integration with existing mute ads functionality

Technical Implementation

1. Added ads_volume attribute to YtLoungeApi class with proper initialization
2. Implemented set_volume_for_ads() method for handling volume changes during ad events
3. Enhanced event processing in both "onAdStateChange" and "adPlaying" events

[dmunozv04]

Hi there, thanks for the PR!

I'll look it more into detail when I get some time, but I'm wondering how it's able to know the original volume if self.volume_state.get("volume") seems to get changed when the volume changes for the ad.

[vivektiwari1986]

You are right. Setting on ad start will cause a eventType - onVolumeChanged and change it again. I ll add a original_pre_ads_volume that is set before ad star action.

I posted this PR for early feedback. Planning to run a test on my apple tv and lg tv app today.