Work on the edge with crypto providers

Prisma has just started letting some users test out a version of Prisma compiled to WASM so that it can run on the edge. I've tested it myself and it looks really promising, yet one problem I have encoutered is that it does not work with prisma-field-encryption yet because of prisma-field-encryption's reliance on Node.js's crypto module which is not available in edge contexts.

My suggestion is to have 'crypto providers' for different contexts, similar to what Stripe does with their Node.js module (see: https://github.com/stripe/stripe-node/tree/master/src/crypto) to support edge contexts. My thinking is that when instantiating prisma-field-encryption, you pass in a crypto provider that works for where you are running Prisma (likely just SublteCrypto and node:crypto are all that is required)

Let me know what you think!