Add unicast semantics to RetransmitHandler #7122

Job	Run time
C++ GCC 6 (Ubuntu 20.04)	3m 14s
C++ Clang 13 (Ubuntu 22.04)	8m 56s
C++ Clang 18 debug build	8m 45s
C++ Clang 9 (Ubuntu 20.04)	8m 29s
C++ Clang 14 (Ubuntu 22.04)	8m 12s
C++ GCC 7 (Ubuntu 20.04)	7m 28s
C++ Clang 10 (Ubuntu 20.04)	8m 51s
C++ GCC 8 (Ubuntu 20.04)	7m 28s
C++ Clang 15 (Ubuntu 22.04)	8m 12s
C++ Clang 11 (Ubuntu 20.04)	8m 37s
C++ GCC 9 (Ubuntu 20.04)	8m 14s
C++ Clang 16 (Ubuntu 22.04)	8m 52s
C++ GCC 11 (Ubuntu 22.04)	8m 5s
C++ Clang 12 (Ubuntu 20.04)	8m 45s
C++ GCC 10 (Ubuntu 20.04)	7m 53s
C++ Clang 17 (Ubuntu 22.04)	8m 15s
C++ GCC 12 (Ubuntu 22.04)	8m 40s
C++ GCC 13 (Ubuntu 22.04)	9m 30s
C++ Clang 18 (Ubuntu 22.04)	8m 20s
C++ Rocky 8 (10)	9m 7s
C++ MSVC (Windows)	9m 16s
C++ Xcode (macOS)	9m 32s
Java 8 (ubuntu-22.04)	3m 41s
Java 8 (windows-latest)	6m 2s
Java Topology Tests (JDK 8, ubuntu-22.04)	2m 27s
Java 8 (macos-14)	4m 58s
Java 17 (ubuntu-22.04)	3m 55s
Java 17 (windows-latest)	6m 18s
Java 17 (macos-14)	5m 8s
Java 21 (ubuntu-22.04)	4m 3s
Java 21 (windows-latest)	7m 8s
Java 21 (macos-14)	5m 27s
	3h 51m 48s

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