DRAFT: add size test of floff algorithm #400

Job	Run time
sanitize	7m 34s
coverage	2m 47s
checks	44s
memcheck	11m 55s
size-test	46s
size-test-embedded (ci-size-coverage-embedded)	1m 13s
unit-tests (gcc, Debug)	5m 43s
size-test-embedded (ci-size-coverage-embedded-nano)	1m 6s
unit-tests (gcc, Release)	3m 10s
unit-tests (clang, Debug)	4m 59s
unit-tests (clang, Release)	3m 37s
	43m 34s

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