Provide APIs to generate cryptographically secure random numbers

[CompeyDev]

Lune currently does not include any methods for generating cryptographically random numbers. For example, Node.JS provides the following APIs:

// Generates a random number of bytes of `size` and triggers `callback`
crypto.randomBytes(size, callback);

// Asynchronously fills `buffer` with random values and triggers `callback`
crypto.randomFill(buffer[, offset[, size]], callback);

It is difficult to implement many cryptographic algorithms with the lack of such APIs.

Implementation

We would have to interface with rust-random and expose Lune APIs in a crypto built-in which achieves this. That would potentially also involve moving existing hashing methods present in the serde built-in, which would be a breaking change.

[Dekkonot]

I am firmly against this for the same reason I'm again including password hashing algorithms in Lune. It feels like a mistake to give people the tools they need to make worse security decisions.