Add a second, portal-compatible ID to the Gradle plugin

To be compatible with Gradle's plugin portal, plugins must have an
ID that uses a reverse domain name. This means that spring-boot is
not compatible.

This commit introduces a new ID, org.springframework.boot, and
deprecates the old ID.

Closes gh-6997

spring-boot-samples/spring-boot-sample-data-neo4j/pom.xml

@@ -23,7 +23,16 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-data-neo4j</artifactId>
 		</dependency>
-
+		<!-- <dependency>
+      		<groupId>org.neo4j</groupId>
+      		<artifactId>neo4j-ogm-embedded-driver</artifactId>
+      		<version>${neo4j-ogm.version}</version>
+		</dependency>
+		<dependency>
+      		<groupId>org.neo4j</groupId>
+      		<artifactId>neo4j-ogm-bolt-driver</artifactId>
+      		<version>${neo4j-ogm.version}</version>
+		</dependency> -->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>