materialize sliced memoryviews in AudioFrame and VideoFrame #1254

Job	Run time
Make RTC sdist	18s
Generating protobuf	14s
Build RTC wheels (x86_64 arm64)	1m 27s
Build RTC wheels (AMD64)	1m 37s
Build RTC wheels (x86_64)	48s
Build RTC wheels (aarch64)	1m 17s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	49s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 13s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	33s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 22s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 51s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	35s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	56s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	46s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	28s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	35s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	38s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	30s
Publish RTC release	-1s
docs	0s
	15m 56s

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