Add support for playout-delay extension #4669

Job	Run time
ci (ubuntu-20.04, gcc, g++, 20, Release)	7m 46s
ci (ubuntu-20.04, gcc, g++, 20, Debug)	7m 32s
ci (ubuntu-20.04, clang, clang++, 20, Release)	8m 4s
ci (ubuntu-20.04, clang, clang++, 20, Debug)	7m 2s
ci (ubuntu-22.04, gcc, g++, 20, Release)	7m 30s
ci (ubuntu-22.04, gcc, g++, 20, Debug)	6m 26s
ci (ubuntu-22.04, clang, clang++, 20, Release)	8m 55s
ci (ubuntu-22.04, clang, clang++, 20, Debug)	7m 43s
ci (macos-12, gcc, g++, 20, Release)	6m 52s
ci (macos-12, gcc, g++, 20, Debug)	5m 35s
ci (macos-14, clang, clang++, 20, Release)	4m 7s
ci (macos-14, clang, clang++, 20, Debug)	4m 3s
ci (windows-2022, cl, cl, 20, Release)	7m 34s
ci (windows-2022, cl, cl, 20, Debug)	6m 26s
	1h 35m 35s

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