Add isKotlinDataClass to KotlinDetector

[0x1306e6d]

Checking whether a class is a Kotlin data class would be useful. For example, we might want to use different binder (mapper) by the kind of the target class. Here's a comment that wants a way to detect: spring-projects/spring-batch#4568 (comment)

I found that BindingReflectionHintsRegistrar uses KClass#isData() only when a type is Kotlin type:

spring-framework/spring-core/src/main/java/org/springframework/aot/hint/BindingReflectionHintsRegistrar.java

Lines 223 to 224 in df238d0

	KClass<?> kClass = JvmClassMappingKt.getKotlinClass(type);
	if (kClass.isData()) {

I think that this pattern would be useful when provided as an utility function like:

// false if the specified class is not a Kotlin type
// if the specified class is a Kotlin type, returns by KotlinDelegate using JvmClassMappingKt
public static boolean isKotlinDataClass(Class<?> clazz) {
    // ...
}

[sdeleuze]

KotlinDetector is designed to allow fast detection without having to load kotlin-reflect which can be more heavy, and I plan to introduce extended related capabilities via #21546 kotlinx-metadata-jvm when a Kotlin 2.0 baseline will be used, as a consequence I decline this issue.