add preconnect audio buffer API to LocalAudioTrack #1365

Job	Run time
Generating protobuf	19s
Make RTC sdist	13s
Build RTC wheels (x86_64 arm64)	52s
Build RTC wheels (AMD64)	2m 59s
Build RTC wheels (aarch64)	1m 23s
Build RTC wheels (x86_64)	50s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	37s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	30s
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
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 27s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	44s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	59s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 12s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	30s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	26s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	50s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	28s
Publish RTC release	-1s
docs	0s
	16m 3s

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