Benchmark: Add sbom4python

[anthonyharrison]

Biased I know as I am the developer and maintainer of sbom4python, but useful to add this tool which generates NTIA conformant SBOMs in both CycloneDX and SPDX formats (assuming the metadata exists with the packages)

[sethmlarson]

Can you submit a pull request? There shouldn't be much to do beyond adding one more script to benchmarks/. I'm getting around to reviewing the one that's been submitted already.