add is_screencast to VideoSource (#575) #1250

Job	Run time
Make RTC sdist	11s
Build RTC wheels (x86_64 arm64)	1m 8s
Build RTC wheels (x86_64)	42s
Build RTC wheels (aarch64)	1m 18s
Build RTC wheels (AMD64)	1m 18s
Generating protobuf	0s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	25s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	42s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	45s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	23s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 41s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	57s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	59s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	54s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	55s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	33s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	25s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	24s
Publish RTC release	0s
docs	0s
	13m 40s

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