Add breakpoint if being debugged functionality #469

Job	Run time
test-linux-add_subdirectory	42s
test-linux-fetchcontent	46s
test-linux-findpackage	25s
test-macos-add_subdirectory	42s
test-macos-fetchcontent	27s
test-macos-findpackage	23s
test-mingw-add_subdirectory	1m 32s
test-mingw-fetchcontent	2m 24s
test-mingw-findpackage	1m 55s
test-windows-add_subdirectory	1m 57s
test-windows-fetchcontent	1m 48s
test-windows-findpackage	1m 12s
	14m 13s

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