Add time functions to measure internal functions #8

Job	Run time
compiler (gcc-7, ubuntu-20.04)	3m 46s
compiler (gcc-8, ubuntu-20.04)	3m 44s
compiler (gcc-9, ubuntu-20.04)	3m 56s
compiler (gcc-10, ubuntu-20.04)	4m 1s
compiler (gcc-11, ubuntu-22.04)	4m 19s
compiler (gcc-12, ubuntu-22.04)	4m 57s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	4m 26s
compiler (clang-6.0, ubuntu-20.04)	34s
compiler (clang-7, ubuntu-20.04)	27s
compiler (clang-8, ubuntu-20.04)	34s
compiler (clang-9, ubuntu-20.04)	35s
compiler (clang-10, ubuntu-20.04)	24s
compiler (clang-11, ubuntu-20.04)	20s
compiler (clang-12, ubuntu-20.04)	22s
compiler (clang-13, ubuntu-22.04)	35s
compiler (clang-14, ubuntu-22.04)	28s
compiler (clang-15, ubuntu-22.04, jammy)	23s
compiler (clang-16, ubuntu-22.04, jammy)	29s
	34m 20s

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