Improve displayed error by using DataFusionError's Display trait

[abey79]

Which issue does this PR close?

Closes #1369

Rationale for this change

The error displayed by the snippet in #1369 now is:

Exception: DataFusion error: Schema error: No field named does_not_exist. Valid fields are users.id, users.name, users.age.

It previously was:

Exception: DataFusion error: SchemaError(FieldNotFound { field: Column { relation: None, name: "does_not_exist" }, valid_fields: [Column { relation: Some(Bare { table: "users" }), name: "id" }, Column { relation: Some(Bare { table: "users" }), name: "name" }, Column { relation: Some(Bare { table: "users" }), name: "age" }] }, Some(""))

What changes are included in this PR?

This uses the Display trait instead of the Debug trait of DataFusionError when displaying errors.

Are there any user-facing changes?

Yes. Error display.