stream.rs: Add set_control function
Used like:
let values = [0.8, 0.8];
stream.set_control(pipewire::spa::sys::SPA_PROP_channelVolumes, &values).expect("Unable to set volume");
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Used like:
let values = [0.8, 0.8];
stream.set_control(pipewire::spa::sys::SPA_PROP_channelVolumes, &values).expect("Unable to set volume");