Datastore - Support IndexedDBAdapter for WebWorker

[tlikits]

Is your feature request related to a problem? Please describe.
We have a project plan that to use the Datastore with the WebWorker, and store the synced data into the local IndexedDB.
But the current behavior is it will pick the AsyncStorageAdapter instead of IndexedDBAdapter. As it only allow to use IndexedDBAdapter when browserOrNode().isBrowser is true.

Describe the solution you'd like
Currently, required('@aws-amplify/core').browserOrNode().isBrowser is return as false when we use the WebWorker, as this flag is check by typeof window !== 'undefined' && typeof window.document !== 'undefined', which the window will always be, by default, undefined in WebWorker.

So I suggest providing isWebWorker flag in the JS, with the following logic:
typeof self !== 'undefined' && self.constructor.name === 'DedicatedWorkerGlobalScope';

And update the getDefaultAdapter, to check (isBrowser && window.indexedDB) && (isWebWorker && self.indexedDB).

Describe alternatives you've considered
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Additional context
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[iartemiev]

Thank you for opening the PR, @wylfent. It was released as part of aws-amplify@unstable and will be included in the next stable release this week.

[github-actions]

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