chore: `blobStore.setDownloadFilter()` & `createEntriesReadableStream()`

[gmaclennan]

Fixes #681

• Removes blobStore.download() and the LiveDownload class.
• Adds blobStore.createEntriesReadableStream() which is a stream of all entries in the blob store, filtered by blob type and variant(s).
• Changes behaviour of BlobStore to auto-download blobs according to a downloadFilter.
• Changes the BlobStore filter according to isArchiveDevice setting.
• Changes the behaviour of CoreManager to not auto-download blob cores (this responsibility is now with BlobStore).

TODO:

• [x] Add e2e tests for blob downloads for non-archive device (see BlobStore unit tests for example).

[EvanHahn]

Added end-to-end tests in d374b20ed21f124803891f61db29e85ddac198e0.

This will currently break if deployed. If you set yourself as a non-archive device, sync will be partially broken. I'm going to merge this into the media-manager-v1 branch until it's ready to deploy.