Add GraphQL Spring Boot starter

This new starter brings the following dependencies:

* the base starter
* the JSON starter
* the Spring GraphQL dependency

See gh-29140

Author: bclozel

Diff for: spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1501,6 +1501,7 @@ bom {
 				"spring-boot-starter-data-neo4j",
 				"spring-boot-starter-data-rest",
 				"spring-boot-starter-freemarker",
+				"spring-boot-starter-graphql",
 				"spring-boot-starter-groovy-templates",
 				"spring-boot-starter-hateoas",
 				"spring-boot-starter-integration",

Diff for: spring-boot-project/spring-boot-starters/spring-boot-starter-graphql/build.gradle

@@ -0,0 +1,11 @@
+plugins {
+	id "org.springframework.boot.starter"
+}
+
+description = "Starter for building GraphQL applications with Spring GraphQL"
+
+dependencies {
+	api(project(":spring-boot-project:spring-boot-starters:spring-boot-starter"))
+	api(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-json"))
+	api("org.springframework.graphql:spring-graphql")
+}