feat: Shamir's secret sharing

[lonerapier]

Resources:

• https://web.mit.edu/6.857/OldStuff/Fall03/ref/Shamir-HowToShareASecret.pdf
• https://decentralizedthoughts.github.io/2020-07-17-polynomial-secret-sharing-and-the-lagrange-basis/
• https://crypto.stanford.edu/cs355/19sp/lec6.pdf
• verifiable secret sharing?

[eightfilms]

i can work on this unless you're picking this up! @lonerapier

[lonerapier]

It's all yours sir. I'd ask @Autoparallel, he was interested in tackling this

[Autoparallel]

I haven't assigned this, i think this is a great problem for another contributor actually :)

[lonerapier]

I think we should start assigning good first issue labels, so that it's easier for any contributor