Refine build time init configuration

For Spring MVC and RestTemplate.

See spring-projectsgh-28518

Author: sdeleuze

spring-core/src/main/resources/META-INF/native-image/org.springframework/spring-core/native-image.properties

@@ -1,2 +1,5 @@
 Args = --initialize-at-build-time=org.springframework.aot.AotDetector,\
-org.springframework.core.NativeDetector
+org.springframework.core.NativeDetector,\
+org.springframework.util.ConcurrentReferenceHashMap,\
+org.springframework.core.SpringProperties,\
+org.springframework.util.ClassUtils

spring-web/src/main/resources/META-INF/native-image/org.springframework/spring-web/native-image.properties

@@ -1 +1,2 @@
-Args = --initialize-at-build-time=org.springframework.http.HttpStatus
+Args = --initialize-at-build-time=org.springframework.http.HttpStatus,\
+org.springframework.web.client.RestTemplate

spring-webmvc/src/main/resources/META-INF/native-image/org.springframework/spring-webmvc/native-image.properties

@@ -0,0 +1 @@
+Args = --initialize-at-build-time=org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport