feat(req): port of reqsketch-rs

[pmcgleenon]

This is a port of reqsketch-rs as discussed here #90. This implementation is influenced heavily by the apache datasketches C++ implementation.

Some things present in reqsketch-rs that are not part of this PR:

• benchmarks, I left these out since I didn't see any other benchmarks. Maybe we can add some in a later PR for all the sketches
• program build the plots rank error plots. There are a bunch of dependencies needed for this so I left it out. But I think it's a great visualization of the reqsketch algorithm and helps with validation of the results since the apache-datasketches project has similar plots and they can be easily compared to validate the results

@tisonkun FYI if you get a chance please take a look

[tisonkun]

Thanks for your contribution @pmcgleenon! I'll review this patch in this week.