Optionally display schema in explain plan

[alamb]

Is your feature request related to a problem or challenge?

In the context of:

• Improve performance for grouping by variable length columns (strings) #9403
• [Epic] Implement support for StringView in DataFusion #10918

I have been contemplating adding optimizations that DataTypes between certain operators (e.g. to DictionaryArray or StringArray)

Describe the solution you'd like

Thus I would like to be able to see the schema in the query plans as part of that project

Describe alternatives you've considered

Including detailed schema information for all plans is likely too much detail, but having an option to show it would be useful

Thus I would like a config option for showing schema

set datafusion.explain.show_schema = true;

Additional context

No response