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

framework-bom/framework-bom.gradle

@@ -7,7 +7,7 @@ group = "org.springframework"
 
 dependencies {
 	constraints {
-		parent.moduleProjects.sort { "$it.name" }.each {
+		parent.moduleProjects.findAll{ it.name != 'spring-core-graalvm' }.sort { "$it.name" }.each {
 			api it
 		}
 	}