Stream objects between buckets

[dominictarro]

Can copy an S3 Object from one S3Bucket to another S3Bucket without reading the entire object into memory. Buckets may have separate credentials and even owners.

Closes
#275

Example

Screenshots

Checklist

• References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• Includes tests or only affects documentation.
• Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• Includes screenshots of documentation updates.
  • Run mkdocs serve view documentation locally.
• Summarizes PR's changes in CHANGELOG.md

[desertaxle]

LGTM!