Restyle s3: copy large objects without chunking #3187
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When executing `boto3.s3.Client.Copy`, large files are chunked into multiple parts. The default chunk threshold and size is 8MB. This caused an issue when caching an object larger than 8M, where the original object had not been uploaded in multiple parts. The original object and the cached object would have different ETags, causing an exception. This fixes the issue by dynamically setting the chunk threshold to be one byte larger than the size of the original object therefore avoiding multipart copies. Fixes #3174
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A duplicate of #3186 with additional commits that automatically address
incorrect style, created by Restyled.
Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.
The following Restylers made fixes:
To incorporate these changes, you can either:
Merge this Pull Request instead of the original, or
Ask your contributor to locally incorporate these commits and push them to
the original Pull Request
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NOTE: As work continues on the original Pull Request, this process will
re-run and update (force-push) this Pull Request with updated style fixes as
necessary. If the style is fixed manually at any point (i.e. this process finds
no fixes to make), this Pull Request will be closed automatically.
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