fix: Move `default` constructor impl in CPP file (#3752) #1843

Job	Run time
linux_ubuntu_extra (ubuntu2204, 20)	6m 5s
macos	8m 14s
linux_ubuntu	6m 4s
linux_ubuntu_extra (ubuntu2204_clang, 20)	5m 56s
linux_examples_test	11m 45s
linux_physmon	17m 42s
linux_physmon_perf_report	0s
	55m 46s

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