Expose important CSPRNG: crypto.getRandomValues

RN does not support `globalThis.crypto`. It's understandable, the module is huge.

There is no need in re-implementing the whole `crypto` module. Just one function: `crypto.getRandomValues`. The function exposes CSPRNG (cryptographically secure pseudorandom number generator). The function is critical to MANY apps which are not even related to deep tech.

It's important for one reason: without exposing the function, many people will go path of least resistance and simply switch to `Math.random()` which is PRNG, but not cryptographically secure. This has happened in the past and apps have been broken with catastrophic results: https://www.deepsource.com/blog/dont-use-math-random, https://owasp.org/www-community/vulnerabilities/Insecure_Randomness, https://blog.ledger.com/Funds-of-every-wallet-created-with-the-Trust-Wallet-browser-extension-could-have-been-stolen/

I write popular cryptographic libraries. Everything else is easily polyfillable. ed25519, sha3, pbkdf2, whatever. The CSPRNG is not easily polyfillable: it exposes low-level system interface. You cannot emulate or simulate this.