Add new crate denoise required by audio (#38217)

The audio crate will use the denoise crate to remove background noises
from microphone input.

We intent to contribute this to rodio. Before that can happen a PR needs
to land in candle. Until then this lives here.

Uses a candle fork which removes the dependency on `protoc` and has the PR's mentioned above already applied.

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/denoise/examples/enable_disable.rs

@@ -0,0 +1,23 @@
+use std::time::Duration;
+
+use rodio::Source;
+use rodio::wav_to_file;
+use rodio::{nz, source::UniformSourceIterator};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let file = std::fs::File::open("clips_airconditioning.wav")?;
+    let decoder = rodio::Decoder::try_from(file)?;
+    let resampled = UniformSourceIterator::new(decoder, nz!(1), nz!(16_000));
+
+    let mut enabled = true;
+    let denoised = denoise::Denoiser::try_new(resampled)?.periodic_access(
+        Duration::from_secs(2),
+        |denoised| {
+            enabled = !enabled;
+            denoised.set_enabled(enabled);
+        },
+    );
+
+    wav_to_file(denoised, "processed.wav")?;
+    Ok(())
+}