refactor(userspace/engine): reduce allocations during rules loading #2384

Job	Run time
fetch-version / fetch-version	1m 15s
build-dev-minimal / build-and-test	3m 7s
build-dev / build-and-test	6m 8s
build-dev-minimal-arm64 / build-and-test	2m 42s
build-dev-packages / build-wasm-package	4m 41s
build-dev-packages / build-modern-bpf-skeleton	3m 1s
build-dev-packages / build-macos-package	9m 30s
build-dev-packages / build-musl-package	0s
build-dev-packages / build-win32-package	8m 9s
build-dev-packages-arm64 / build-modern-bpf-skeleton	2m 16s
build-dev-packages-arm64 / build-musl-package	0s
build-dev-packages-arm64 / build-macos-package	0s
build-dev-packages-arm64 / build-wasm-package	0s
build-dev-packages-arm64 / build-win32-package	0s
build-dev-packages-arm64 / build-packages	18m 6s
build-dev-packages / build-packages	21m 14s
check-engine-checksum	3s
check-engine-version	5s
test-dev-packages / test-packages	2m 54s
test-dev-packages-arm64 / test-packages	1m 12s
	1h 24m 23s

Provide feedback