[FIR] Report UNSUPPORTED for default value in function type

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/diagnostics/ConeDiagnostics.kt

@@ -204,6 +204,9 @@ class ConeImportFromSingleton(val name: Name) : ConeDiagnostic {
 
 open class ConeUnsupported(override val reason: String, val source: KtSourceElement? = null) : ConeDiagnostic
 
+open class ConeUnsupportedDefaultValueInFunctionType(source: KtSourceElement? = null) :
+    ConeUnsupported("Default value of parameter in function type", source)
+
 class ConeUnresolvedParentInImport(val parentClassId: ClassId) : ConeDiagnostic {
     override val reason: String
         get() = "unresolved import"