feat: flatten parent projections when pretty printing structure instance notation #3749
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…nce notation
Given
```lean
structure A where
x : Nat
structure B extends A where
y : Nat
```
rather than pretty printing `{ x := 1, y := 2 : B }` as `{ toA := { x := 1 }, y := 2 }`,
it not pretty prints as `{ x := 1, y := 2 }`.
The option `pp.structureInstances.flatten` controls whether to flatten structure instances like this.
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Given
rather than pretty printing
{ x := 1, y := 2 : B }as{ toA := { x := 1 }, y := 2 }, it now pretty prints as{ x := 1, y := 2 }.The option
pp.structureInstances.flattencontrols whether to flatten structure instances like this.