feat(Crypto): define PRGs and their security definition - #876
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Formalizes Boneh-Shoup's definitions of PRGs and proves the impossibility of making an extending PRG against an arbitrary adversary. Takes the approach of #766 by defining the construction and proving the impossibility in certain contexts, motivating the future computational security definitions.
Composed with Astra using Codex based on some code that I had written by hand.