Move BindingReflectionHintsRegistrar to spring-context

Closes gh-28735

spring-context/spring-context.gradle

@@ -1,6 +1,7 @@
 description = "Spring Context"
 
 apply plugin: "kotlin"
+apply plugin: "kotlinx-serialization"
 
 dependencies {
 	api(project(":spring-aop"))
@@ -32,6 +33,7 @@ dependencies {
 	testImplementation("org.apache.commons:commons-pool2")
 	testImplementation("org.awaitility:awaitility")
 	testImplementation("jakarta.inject:jakarta.inject-tck")
+	testImplementation("org.jetbrains.kotlinx:kotlinx-serialization-json")
 	testRuntimeOnly("jakarta.xml.bind:jakarta.xml.bind-api")
 	testRuntimeOnly("org.glassfish:jakarta.el")
 	// Substitute for javax.management:jmxremote_optional:1.0.1_04 (not available on Maven Central)