Refactor Internal_Core

[AdRiley]

Pull Request Description

Applies the new module private rules to the module previously called Internal_Core.

I hope that this is a good example of the benefits of the new approach.

The main changes are

• renaming the module to Upload_Table
• defining the public API and private implementation of Upload_Table

And I believe it actually finds a defect in that previously the usage in Delete.Enso was calling directly into the (now private) method _create_in_memory_table_upload_op which bypassed the shared logic that lives in the (now explicity public) create_table_upload_operation

Important Notes

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.