fix(artifacts): add s3 multipart uploading for artifact files

[estellazx]

Fixes

Fixes WB-11826

Description

Enables multipart upload for S3 for artifact files. In the past, artifact files larger than 5 GiB would get errors when uploading to AWS S3. Now using S3 multipart upload we can upload files up to 5 TiB if internet speed and disk space permits.

Testing

• Manually testing S3 uploads on local and QA. Existing GCS uploads are not effected and S3 is able to upload files over 5 GB now. Was able to upload 200 GB under fast wifi without any problems
• Manually backwards compatibility test with https://multi-part.wandb.ml/ which is set to (0.30.0 before multipart server changes in 0.32.0)
• Unit tests

🤖 Generated by Copilot at 8268f45

Oh we are the wandb crew and we have a job to do
We're uploading artifacts in chunks to S3
We use the Api class and the WandbStoragePolicy
And we heave away on the count of three

[moredatarequired]

I think we need to add tests before I'm willing to merge this. I know it's a pain to weave it in, but I think we also need to rework it a bit to enable reading only a chunk of a file at a time; ideally in a way that won't be too hard to adapt to asyncio / aiofiles in the future.

[moredatarequired]

Thanks for adding all the new tests! I know this was a long process, but this looks good to me 👍