Reduce vortex-fastlanes debug symbols size by introducing debug-only path #4016

Job	Run time
Rust publish dry-run	23s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=27820824083/runner=amd64-medium/image...	1m 5s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=27820824083/runner=arm64-medium/imag...	1m 28s
Python (wheel build)	5m 25s
Compat check / compat-test	6m 6s
	14m 27s

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