Add autoconfig processor to improve startup time

This commit adds the Spring Boot autoconfiguration processor to generate
the `META-INF/spring-autoconfigure-metadata.properties`,which will improve
startup time.

Signed-off-by: Chris Bono <chris.bono@gmail.com>

spring-grpc-spring-boot-autoconfigure/pom.xml

@@ -42,7 +42,11 @@
 			<artifactId>spring-boot-configuration-processor</artifactId>
 			<optional>true</optional>
 		</dependency>
-
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-autoconfigure-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.grpc</groupId>
 			<artifactId>spring-grpc-core</artifactId>