Update github.com/klauspost/compress version.
Add github.com/klauspost/reedsolomon and github.com/minio/md5-simd.
Add `-mod=mod` to commands due to golang/go#44129.
Adds @klauspost's S2 implementation to the third party test suite.
The full klauspost/compress tests are slow but we only care about the S2 sub-package. Therefore this PR also adds the option to only run a subset of the package tests, controlled by a "test" parameter in the JSON configuration.
Closes#130
