Reland "Record audio timestamp across all ObjC ADMs."

This is a reland of commit fa780492c902b0b0079386178b21b9c61221f25e

Original change's description:
> Record audio timestamp across all ObjC ADMs.
>
> Added audio timestamp capture to ObjCAudioDeviceModule and extracted
> nanoseconds from AudioTimeStamp construction into helper function.
>
> The timestamp capture was initially implemented in the CL:
> https://webrtc-review.googlesource.com/c/src/+/334720
>
> No-Try: True
> Bug: webrtc:13609
> Change-Id: I68d5c29ccc98cf817365988fa825875841e32ee7
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/397160
> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
> Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#45000}

Bug: webrtc:13609
Change-Id: I82d753d02b17b917b4d57ce3e466a685ce1c7bca
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/397760
Commit-Queue: Yury Yarashevich <yura.yaroshevich@gmail.com>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#45021}