Support of en/decapsulation in the pkeyutl command #315

Job	Run time
compiler (gcc-7, ubuntu-20.04)	4m 13s
compiler (gcc-8, ubuntu-20.04)	4m 30s
compiler (gcc-9, ubuntu-20.04)	4m 37s
compiler (gcc-10, ubuntu-20.04)	4m 22s
compiler (gcc-11, ubuntu-22.04)	4m 31s
compiler (gcc-12, ubuntu-22.04)	5m 18s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	9m 7s
compiler (clang-6.0, ubuntu-20.04)	4m 30s
compiler (clang-7, ubuntu-20.04)	4m 58s
compiler (clang-8, ubuntu-20.04)	5m 49s
compiler (clang-9, ubuntu-20.04)	4m 53s
compiler (clang-10, ubuntu-20.04)	4m 52s
compiler (clang-11, ubuntu-20.04)	4m 47s
compiler (clang-12, ubuntu-20.04)	4m 56s
compiler (clang-13, ubuntu-22.04)	5m 32s
compiler (clang-14, ubuntu-22.04)	5m 9s
compiler (clang-15, ubuntu-22.04, jammy)	5m 16s
compiler (clang-16, ubuntu-22.04, jammy)	5m 14s
compiler (clang-17, ubuntu-22.04, jammy)	5m 19s
	1h 37m 53s

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