Port the build to Gradle

Closes gh-19609
Closes gh-19608

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/build.gradle

@@ -0,0 +1,27 @@
+plugins {
+	id 'java-library'
+	id 'org.springframework.boot.conventions'
+	id 'org.springframework.boot.deployed'
+}
+
+description = 'Spring Boot Configuration Annotation Processor'
+
+sourceSets {
+	main {
+		java {
+			srcDir file("src/json-shade/java")
+		}
+	}
+}
+
+dependencies {
+	testImplementation enforcedPlatform(project(":spring-boot-project:spring-boot-dependencies"))
+	testImplementation project(":spring-boot-project:spring-boot-tools:spring-boot-test-support")
+	testImplementation "javax.validation:validation-api"
+	testImplementation "org.assertj:assertj-core"
+	testImplementation "org.hamcrest:hamcrest-library"
+	testImplementation "org.junit.jupiter:junit-jupiter"
+	testImplementation "org.mockito:mockito-core"
+	testImplementation "org.projectlombok:lombok"
+	testImplementation "org.springframework:spring-core"
+}