fix: auth-client usage in web worker and nodejs

[peterpeterparker]

Description

auth-client cannot be used in web worker or in NodeJS context because window.localStorage is not available.

e.g. stacktrace while trying to use v0.13.1 in a jest test:

ReferenceError: localStorage is not defined

  18 |  */
  19 | export const createAuthClient = (): Promise<AuthClient> =>
> 20 |   AuthClient.create({
     |              ^
  21 |     idleOptions: {
  22 |       disableIdle: true,
  23 |       disableDefaultIdleCallback: true,

  at _openDbStore (node_modules/@dfinity/auth-client/src/db.ts:15:3)
  at Function.create (node_modules/@dfinity/auth-client/src/db.ts:74:22)
  at node_modules/@dfinity/auth-client/src/storage.ts:74:17
  at IdbStorage.get _db [as _db] (node_modules/@dfinity/auth-client/src/storage.ts:72:12)
  at IdbStorage.get (node_modules/@dfinity/auth-client/src/storage.ts:82:27)
  at Function.create (node_modules/@dfinity/auth-client/src/index.ts:197:48)
  at createAuthClient (src/lib/utils/auth.utils.ts:20:14)
  at Object.signOut (src/lib/stores/auth.store.ts:69:60)
  at Object.<anonymous> (src/tests/lib/stores/auth.store.spec.ts:10:21)

Fixes # (issue)

NNS-dapp PR #1247

How Has This Been Tested?

Manually in the browser (window and web worker) and with a jest test.

[krpeacock]

This works! Auth-client was never particularly intended for a Nodejs context, but web workers are definitely a valid use case. Thanks for the improvement!