Fingerprinting 2.0: Web Audio

[pes10k]

This is a sub-issue of the larger fingerprint defense reorganization issue: #8787

Audio data serialization endpoints

AnalyserNode.getByteTimeDomainData
AnalyserNode.getFloatTimeDomainData
AnalyserNode.getByteFrequencyData
AnalyserNode.getFloatFrequencyData
AudioBuffer.getChannelData
AudioBuffer.copyFromChannel

default protection: Farble output volume by [0,-.01] under eTLD+1 session seed
max protection: randomly generate low amplitude white noise under eTLD+1 session seed (with max amplitude / volume being 1% of max representable volume).