Support Kotlin value class properties in SpEL

This commit adds support for inlined Kotlin value
class properties in SpEL by leveraging Kotlin
reflection instead of Java reflection broken
by the mangled method name.

Closes gh-30468

spring-expression/spring-expression.gradle

@@ -4,6 +4,7 @@ apply plugin: "kotlin"
 
 dependencies {
 	api(project(":spring-core"))
+	optional("org.jetbrains.kotlin:kotlin-reflect")
 	testImplementation(testFixtures(project(":spring-core")))
 	testImplementation("org.jetbrains.kotlin:kotlin-reflect")
 	testImplementation("org.jetbrains.kotlin:kotlin-stdlib")