Make expand_to_rows, expand_column support Rows, Tables, Column data types

[AdRiley]

Pull Request Description

Make expand_to_rows work for Table and Column
Make expand_column work for Column and Row

Makes solving the book club exercise easier

Important Notes

We decided expand_column did not make sense for Table as the resulting Table of Columns would rarely be what was wanted.

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,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[radeusgd]

Looks good.

It's good to see that the Convertible_To_Rows and its sibling allow for such easy extensibility of this feature. It's nice to see some cool idioms for abstraction in Enso settling in.

I think we may want to add one test, although I assume it may not be strictly necessary because it is tested by other paths (I think JSON already tests this codepath well).