Benchmark against C implementations

[bovee]

In addition to the new benchmarks against other Rust FASTX readers, it would be nice to have some benchmarks to existing C implementions running in the microbenchmarks:

• pfasta (https://github.com/kloetzl/pfasta)
• kseq (https://github.com/lh3/seqtk)

This probably involves some kind of cbindgen work or something. See also old issues #2 and #15 that involve parts of this scope.

[Keats]

https://github.com/lh3/biofast has needletail and and a few other languages