Feat - Use buffer pool in AudioWorkletGlobalScope

[b-ma]

Built on top of #131

1. Use a buffer pool in worklets to minimize allocations
2. Ensure that input and output cannot be transfered to main thread

  RESULTS:
  - # pass: 7299
  - # fail: 527
  - # type error issues: 3
> wpt duration: 2:50.251 (m:ss.mmm)

[orottier]

Alright, it's quite a bit of extra code (or framed differently: attack surface for bugs) but I guess if it helps real-time safety we should do it.
Looks good to me.

[orottier]

We don't need to set the values to zero because on each render call we copy all input values anyway?

[b-ma]

Yup!