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/ui.groovy

@@ -0,0 +1,33 @@
+package app
+
+@Grab("thymeleaf-spring5")
+@Controller
+class Example {
+
+	@RequestMapping("/")
+	public String helloWorld(Map<String,Object> model) {
+		model.putAll([title: "My Page", date: new Date(), message: "Hello World"])
+		return "home";
+	}
+}
+
+@Configuration
+@Log
+class MvcConfiguration extends WebMvcConfigurerAdapter {
+
+	@Override
+	void addInterceptors(InterceptorRegistry registry) {
+		log.info "Registering interceptor"
+		registry.addInterceptor(interceptor())
+	}
+
+	@Bean
+	HandlerInterceptor interceptor() {
+		log.info "Creating interceptor"
+		[
+			postHandle: { request, response, handler, mav ->
+				log.info "Intercepted: model=" + mav.model
+			}
+		] as HandlerInterceptorAdapter
+	}
+}