Fallback to default visualization based on type, when no viz has been explicitly set

[somebody1234]

Pull Request Description

• Closes Default visualization #8386
  • Attempts to execute <expr>.default_visualization to query the engine for the correct fallback type
  • If that is not possible, falls back to checking inputType - first for an exact match, then falling back to Any (i.e. the text/JSON visualization)
  • Does not decide fallback based on the shape of the returned JSON

Important Notes

Contains pretty significant refactors of VisualizationMetadata to allow it to be unset.

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.

[somebody1234]

spent way too long debugging an issue caused by me, when return (implicit undefined return) when converting to file format when identifier was null, meaning viz visibility was not saved when explicitly using default_visualization.

i haven't checked GUI1 but am assuming this must break compatibility with it, as the original impl lacked nullable project in the file storage format for viz metadata.

[somebody1234]

merged develop into this branch because GitHub says there were conflicts (probably due to the moved files), but merge-ort had no issues