feat(blob): Add multipart option

[vvo]

This PR adds a new option to the put() method: multipart: boolean.

Multipart uploads are useful when uploading a big file to Vercel Blob.
When you use multipart: true in a put() call. Then:

• We turn the body into a (web) stream.
• We read the stream part by part, buffering into memory only what we need to maximize network utilization.

This current PR is an advanced proof of concept and needs some adjustments.

TODO:

• Test in a browser (might need to adjust import from 'stream')
• Test in an edge function (might need to adjust import form 'stream')
• Add a retry mechanism in fetch when uploading parts
• Feedback and validate API
• Feedback and validate implementation
• Unit tests + errors handling (stream errors) + better handling of cancelling multipart uploads
• Integration tests

Not in scope:

• configurable retries, there will be a default algorithm
• configurable concurrent uploads (and memory), there is a default a algorithm

[changeset-bot]

🦋 Changeset detected

Latest commit: 1b7a841

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@vercel/blob	Minor
vercel-storage-integration-test-suite	Patch

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Name	Status	Preview	Updated (UTC)
vercel-storage-next-integration-test-suite	✅ Ready (Inspect)	Visit Preview	Jan 12, 2024 1:37pm

[vvo]

Not sure why it was here in the first place