feat: add perf walltime support #143

Job	Run time
cmake-integration-tests (off, ubuntu-latest)	1m 0s
windows-cmake-build (off)	40s
tests	19s
bazel-integration-tests (walltime, codspeed-macro)	2m 31s
windows-cmake-build (walltime)	37s
bazel-integration-tests (instrumentation, ubuntu-latest)	1m 55s
windows-bazel-build (walltime)	30s
windows-bazel-build (off)	31s
cmake-integration-tests (instrumentation, ubuntu-latest)	3m 15s
bazel-integration-tests (off, ubuntu-latest)	29s
cmake-integration-tests (walltime, codspeed-macro)	3m 33s
	15m 20s

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