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fix: made RTCRtpCodecCapability's int fields optional (#190) #196

Job	Run time
build-linux (linux_x86-64, ubuntu-22.04, 17)	6m 13s
build-linux (linux_arm64, ubuntu-22.04, 17)	6m 8s
build-linux (linux_arm, ubuntu-22.04, 17)	5m 21s
build-macos (macos_x86-64, macos-14, 17)	18m 41s
build-windows (windows_x86_64, windows-2022, 17)	7m 21s
build-macos (macos_arm64, macos-14, 17)	4m 52s
	48m 36s

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