Erasure-coding library research

[asmie]

There is a need to research library for erasure encoding.

Something similar to the Rust one:
https://github.com/paritytech/erasure-coding/blob/main/src/subshard.rs

Ensure the library is aligned with GP Appendix H.

Test vectors from Gavin:
https://gist.github.com/gavofyork/4cde92327cd91eff3e2ab91d316cb83a

Test vectors in the official repo (PRed):
w3f/jamtestvectors#4

[aranw]

I evaluated the github.com/klauspost/reedsolomon library for erasure-coding and it seems to validate against two test cases that I found in the linked issue.

One thing that doesn't seem to work in the library was the Verify call I've left it in the example but commented out. Not fully sure whether this is something we need to get working or not

All code can be found here