Type Approximation: add separate flag to control approx. anonymous type

This extra flexibility is useful for IDE where we always want to
approximate anonymous types but may not want to approximate other local
 types

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/types/PublicTypeApproximator.kt

@@ -28,5 +28,6 @@ internal object PublicTypeApproximator {
         override val definitelyNotNullType: Boolean get() = false
         override val integerLiteralType: Boolean get() = true
         override val intersectionTypesInContravariantPositions: Boolean get() = true
+        override val anonymous: Boolean get() = true
     }
 }