Upload file chunks in parallel

[somebody1234]

Pull Request Description

• Close https://github.com/enso-org/cloud-v2/issues/1640
  • Upload chunks of large files in parallel.
    • Currently, 5 chunks are uploaded at any given time.

Important Notes

None

Testing Instructions

• Just upload a large file to the Cloud backend! No other code should be affected.
  • Uploading small files, and uploading to the Local backend, should still be tested though.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.
• If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries,
  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

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