Replaygain support for Web Player

[kgarner7]

This PR adds ReplayGain support for web player. Notes:

• uses WebAudio (which is not supported in all browsers)
• WebAudio and MediaSession to not behave well, so image/title display may not behave well Github Issue
• PLEASE test this in Safari, when I added this to Navidrome there was an issue on MacOS This should be good now (I have a personal deployment of it which behaves properly now), but still worth checking
• While this PR does support setting the sampling rate, I couldn't figure out how to cleanly support configuring that without a refresh
• It might also be nice to toggle RG from the full-screen player, but the menu is getting kinda full, so I'm going to refrain from adding anything more there

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Name	Status	Preview	Comments	Updated (UTC)
feishin	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 21, 2023 6:31pm

[kgarner7]

A sample rate that can be configured without a refresh is unlikely (at least with createMediaElementSource) for a number of reasons:

• to change the sample rate, you would need to delete and create a new audio context
• this would then require connecting the audio element to this new context
• However, per https://github.com/WebAudio/web-audio-api/issues/1202, you cannot disconnect a media source from source node. This means that the one you first created is the one you're stuck with
• HOWEVER, you cannot attach nodes created from one context to another context.

It might be possible to do through the more roundabout way, but I'm not sure that makes sense.