add preconnect audio buffer API to LocalAudioTrack #1368

Job	Run time
Build RTC wheels (AMD64)	1m 20s
Build RTC wheels (x86_64 arm64)	1m 9s
Generating protobuf	16s
Build RTC wheels (aarch64)	1m 17s
Make RTC sdist	16s
Build RTC wheels (x86_64)	55s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	37s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 44s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	29s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 2s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	26s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 2s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	37s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	43s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	38s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	37s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	48s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	57s
Publish RTC release	0s
docs	0s
	14m 53s

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