feat(core): add unit tests for statistics computation #353

Job	Run time
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 4s
bazel-integration-tests (off, ubuntu-latest)	31s
bazel-integration-tests (walltime, codspeed-macro)	7m 34s
lint	16s
cmake-integration-tests (walltime, codspeed-macro)	7m 47s
tests	19s
cmake-integration-tests (instrumentation, ubuntu-latest)	1m 31s
cmake-integration-tests (off, ubuntu-latest)	1m 5s
cmake-build (ubuntu-latest, walltime)	1m 16s
cmake-build (windows-latest, walltime)	2m 36s
cmake-build (windows-latest, off)	2m 6s
cmake-build (ubuntu-latest, off)	1m 18s
bazel-build (ubuntu-latest, off, 8.4.2)	39s
bazel-build (ubuntu-latest, off, 7.6.2)	33s
bazel-build (ubuntu-latest, off, 9.0.0-pre.20250921.2)	1m 3s
bazel-build (windows-latest, walltime, 7.6.2)	1m 58s
bazel-build (windows-latest, off, 8.4.2)	1m 40s
bazel-build (ubuntu-latest, walltime, 9.0.0-pre.20250921.2)	53s
bazel-build (ubuntu-latest, walltime, 8.4.2)	38s
bazel-build (windows-latest, off, 9.0.0-pre.20250921.2)	1m 37s
bazel-build (windows-latest, walltime, 8.4.2)	2m 7s
bazel-build (ubuntu-latest, walltime, 7.6.2)	30s
bazel-build (windows-latest, walltime, 9.0.0-pre.20250921.2)	2m 17s
bazel-build (windows-latest, off, 7.6.2)	1m 36s
	42m 54s

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