feat: add hardware latency reporting to ASIO, CoreAudio, JACK, WASAPI and WebAudio

[roderickvd]

Currently, playback - callback underreports host latency on several hosts because the hardware pipeline delay isn't included.

This PR fixes it using each host's native API:

• CoreAudio: adds kAudioDevicePropertyLatency + kAudioDevicePropertySafetyOffset
• WASAPI: adds GetStreamLatency() (hardware latency beyond the buffer)
• ASIO: adds ASIOGetLatencies() (hardware latency beyond the buffer)
• JACK: uses CycleTimes::next_usecs directly instead of estimating from current_usecs + buffer_duration
• WebAudio: adds AudioContext.baseLatency + outputLatency

Supersedes #964
Fixes #773

[Copilot]

Pull request overview

This PR improves cross-backend timestamp accuracy by incorporating driver-/platform-reported latency components into OutputStreamTimestamp (and related input timestamps where applicable), making callback timing metadata better reflect when audio is actually captured/played by hardware.

Changes:

• WebAudio/WebAudioWorklet: incorporate baseLatency and outputLatency into output playback timestamps.
• WASAPI: compute output playback timestamps using endpoint buffer padding plus IAudioClient::GetStreamLatency().
• CoreAudio/JACK/ASIO: refine timestamps using device latency + safety offset (CoreAudio), cycle deadline (JACK), and ASIO driver-reported hardware latency (ASIO + asio-sys bindings).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/host/webaudio/mod.rs	Adds base/output latency compensation when reporting output playback timestamps.
src/host/audioworklet/mod.rs	Snapshots WebAudio latency values and factors them into worklet output playback timestamps.
src/host/wasapi/stream.rs	Updates output timestamp calculation to use buffer padding + stored stream latency.
src/host/wasapi/device.rs	Captures WASAPI stream latency during stream construction and stores it in StreamInner.
src/host/jack/stream.rs	Uses JACK cycle next_usecs (when available) for more precise output playback timestamps.
src/host/coreaudio/macos/device.rs	Adds device latency + safety offset to CoreAudio timestamp delay computation.
src/host/asio/stream.rs	Incorporates ASIO driver latency frames into input/output timestamp delay calculations.
asio-sys/src/bindings/mod.rs	Exposes Driver::latencies() wrapping ASIOGetLatencies.
asio-sys/build.rs	Allowlists ASIOGetLatencies for bindgen-generated bindings.
asio-sys/asio_stub_bindings.rs	Adds a stub ASIOGetLatencies symbol for docs/non-Windows builds.
CHANGELOG.md	Documents improved timestamp behavior across backends.
asio-sys/CHANGELOG.md	Documents the newly added Driver::latencies() API.

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