Relocate projects to spring-boot-project

Move projects to better reflect the way that Spring Boot is released.

The following projects are under `spring-boot-project`:

  - `spring-boot`
  - `spring-boot-autoconfigure`
  - `spring-boot-tools`
  - `spring-boot-starters`
  - `spring-boot-actuator`
  - `spring-boot-actuator-autoconfigure`
  - `spring-boot-test`
  - `spring-boot-test-autoconfigure`
  - `spring-boot-devtools`
  - `spring-boot-cli`
  - `spring-boot-docs`

See gh-9316

spring-boot-project/spring-boot-cli/samples/caching.groovy

@@ -0,0 +1,47 @@
+package org.test
+
+import java.util.concurrent.atomic.AtomicLong
+
+@Configuration
+@EnableCaching
+class Sample {
+
+	@Bean CacheManager cacheManager() {
+		new ConcurrentMapCacheManager()
+	}
+
+	@Component
+	static class MyClient implements CommandLineRunner {
+
+		private final MyService myService
+
+		@Autowired
+		MyClient(MyService myService) {
+			this.myService = myService
+		} 
+
+		void run(String... args) { 
+			long counter = myService.get('someKey')
+			long counter2 = myService.get('someKey')
+			if (counter == counter2) {
+				println 'Hello World'
+			} else {
+				println 'Something went wrong with the cache setup'
+			}
+
+		}
+	}
+
+	@Component
+	static class MyService {
+
+		private final AtomicLong counter = new AtomicLong()
+
+		@Cacheable('foo')
+		Long get(String id) {
+			return counter.getAndIncrement()
+		}
+
+	}
+
+}