feat: Oblivious Transfer

[lonerapier]

Implement oblivious transfer and various extensions:

• 1-out-of-2 OT
• 1-n OT
• k-n OT

[lonerapier]

will try to hack on this, assigning to myself

[mahmudsudo]

can i take on this ?

[Autoparallel]

@mahmudsudo see #133

Maybe we can help carry that across, or at least use some of it moving forward. Check that PR out and let me know what you think.