Remove the node protocol from the require statement

[aron]

This should improve the situation for certain JavaScript bundlers in the ecosystem which do not like the node:crypto require statement, see #225 and #243.

[aron]

Urgh, this is probably a no-go too, if we remove the node: prefix we break Cloudflare:

✘ [ERROR] Could not resolve "crypto"

    ../../lib/util.js:95:21:
      95 │     crypto = require("crypto").webcrypto;
         ╵                      ~~~~~~~~

  The package "crypto" wasn't found on the file system but is built into node.
  Add "node_compat = true" to your wrangler.toml file and make sure to prefix the module name with "node:" to enable Node.js compatibility.

[mattt]

@aron Thanks for taking the time to add an integration test for Next.js!

[mattt]

I love this. Thanks so much for your work on this. Here's hoping that this will resolve the issues folks were having with standard library imports.