Ability to show syntax tree in the playground

[torhovland]

Is your feature request related to a problem? Please describe.
It should be able to turn on display of parsed syntax tree in the playground. Maybe even a GraphViz figure!

Describe the solution you'd like
A checkbox for enabling syntax tree output.

Describe alternatives you've considered
The alternative is to not do this.

Additional context
See https://ormolu-live.tweag.io and https://tree-sitter.github.io/tree-sitter/playground for inspiration.

[Xophmeister]

An addendum to this would be to highlight matches of a particular query, either in the code, the visualisation, or both. Maybe that's worth a separate issue, as it would go a long way towards creating a powerful debugging tool...