feat(storage-manager): add multi-file zipdownload

[bobbor]

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⚠️ No Changeset found

Latest commit: d45aeee

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[bobbor]

there is no changeset by design.
the implementation can be used in next (unstable) releases, but should not be part of a version

[ahmedhamouda78]

question: what's the reason behind 250ms specifically?

[bobbor]

so the issue is, that the handler gets invoked for every file individually.
The handler itself manages a queue of files to download or which are downloading.

Since the download-handler, is only invoked on 4 files at a time, it can happen, that before the next file is being queued by the storage-manager, the download-handler "thinks" the queue is empty and assumes it has processed all files.

this small delay, gives the storage-manager some time push more files into the download-handler, and thus continue downloading.

It would be much more beneficial, if the action-handlers would know how many files are being processed in total e.g. like Array.map, where the signature is <T, R>(item: T, index: number, all: T[]) => R[]

but I'll do a follow-up on this one in another PR