fix/471-more-resilient-getwebcrypto

[MasterKale]

This PR refines the changes made to getWebCrypto() in #468 by moving the try / catch into _getWebCryptoInternals.stubThisImportNodeCrypto. This should prevent non-Node runtimes from A) getting hung up on the use of import() or B) trying to use it to import a Node-specific identifier.

Fixes #471.

In an effort to confirm the fix, I tested these changes in the following "edge runtimes":

• A simple Astro project, and also with npx astro add cloudflare added in for CF support (as per #471)
  • npm start wouldn't recreate the original issue, but I confirmed that npm run build experienced the error described in #471 with @simplewebauthn/server@8.3.4 but not with these changes
• A basic CloudFlare Worker project, and again with compatibility_flags = [ "nodejs_compat" ] in wrangler.toml

I tested with the following code:

import { generateAuthenticationOptions } from '@simplewebauthn/server';

// ...

const opts = await generateAuthenticationOptions(); 

Proof

Astro

CloudFlare Worker