crypto tests: import everything from index

[HerbCaudill]

libsodium has an async initialization step, which we deal with using a top-level await in the crypto package's main export:

auth/packages/crypto/src/index.ts

Line 3 in 573c17e

await sodium.ready

But some tests were importing directly from the individual modules, e.g.

auth/packages/crypto/src/test/randomKey.test.ts

Line 2 in 1463003

import { randomKey, randomKeyBytes } from '../randomKey.js'

and this was causing a race condition that resulted in intermittent test failures in the crypto package.

This PR ensures that all tests import from ../index.js so that libsodium is always initialized before we try to use it.

Testing plan

Confirm that the crypto tests consistently pass

[brentkeller]

Lgtm and the tests were always passing when I ran them 👍