Replace build-time initialization by constant fields

This commit leverages a subset of @philwebb initial experimentation
to compute at build time the value of specific boolean static fields
in native images. This enhancement is implemented for now as a
GraalVM feature.

The goal here is to keep an optimized footprint via build time code
removal without leveraging build-time class initialization which is known
for the blocking compatibility issues it introduces due to its viral nature.

For now, the static fields initialized at build time with native are:
 - NativeDetector#imageCode
 - Fields with a name ending by "Present" in "org.springframework" package
   typically used for classpath check with ClassUtils#isPresent

Closes gh-28624

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

@@ -1,5 +0,0 @@
-Args = --initialize-at-build-time=org.springframework.aot.AotDetector,\
-org.springframework.core.NativeDetector,\
-org.springframework.util.ConcurrentReferenceHashMap,\
-org.springframework.core.SpringProperties,\
-org.springframework.util.ClassUtils