FIR/Analysis API: Get parameter name from function type notation or

`@ParameterName` annotation, which is also now added during type
resolution.

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

@@ -183,6 +183,11 @@ sealed class FirFakeSourceElementKind : FirSourceElementKind() {
 
     // for annotation moved to another element due to annotation use-site target
     object FromUseSiteTarget : FirFakeSourceElementKind()
+
+    // for `@ParameterName` annotation call added to function types with names in the notation
+    // with a fake source that refers to the value parameter in the function type notation
+    // e.g., `(x: Int) -> Unit` becomes `Function1<@ParameterName("x") Int, Unit>`
+    object ParameterNameAnnotationCall : FirFakeSourceElementKind()
 }
 
 sealed class FirSourceElement {

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

@@ -27,6 +27,6 @@ class CustomAnnotationTypeAttribute(val annotations: List<FirAnnotation>) : Cone
         get() = CustomAnnotationTypeAttribute::class
 }
 
-private val ConeAttributes.custom: CustomAnnotationTypeAttribute? by ConeAttributes.attributeAccessor<CustomAnnotationTypeAttribute>()
+val ConeAttributes.custom: CustomAnnotationTypeAttribute? by ConeAttributes.attributeAccessor<CustomAnnotationTypeAttribute>()
 
 val ConeAttributes.customAnnotations: List<FirAnnotation> get() = custom?.annotations.orEmpty()