Extract some cone type utils properties to reuse them in visualizer

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -977,14 +977,6 @@ class FirRenderer(builder: StringBuilder, private val mode: RenderMode = RenderM
         print("|")
     }
 
-    private val FirResolvedTypeRef.functionTypeKind: FunctionClassKind?
-        get() {
-            val classId = (type as? ConeClassLikeType)?.lookupTag?.classId ?: return null
-            return FunctionClassKind.getFunctionalClassKind(
-                classId.shortClassName.asString(), classId.packageFqName
-            )
-        }
-
     override fun visitUserTypeRef(userTypeRef: FirUserTypeRef) {
         userTypeRef.annotations.renderAnnotations()
         if (userTypeRef.customRenderer) {

compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeUtils.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.types
 
+import org.jetbrains.kotlin.builtins.functions.FunctionClassKind
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.symbols.StandardClassIds
@@ -168,4 +169,15 @@ val ConeKotlinType.canBeNull: Boolean
             is ConeIntersectionType -> intersectedTypes.any { it.canBeNull }
             else -> isNullable
         }
-    }
+    }
+
+val ConeKotlinType?.functionTypeKind: FunctionClassKind?
+    get() {
+        val classId = (this as? ConeClassLikeType)?.lookupTag?.classId ?: return null
+        return FunctionClassKind.getFunctionalClassKind(
+            classId.shortClassName.asString(), classId.packageFqName
+        )
+    }
+
+val FirResolvedTypeRef.functionTypeKind: FunctionClassKind?
+    get() = type.functionTypeKind