create channel configuration for file-manager

ozg-cloud-spring-boot-starter/src/main/java/de/ozgcloud/client/autoconfigure/OzgCloudClientAutoConfiguration.java

@@ -90,6 +90,16 @@ public class OzgCloudClientAutoConfiguration {
 				.build();
 	}
 
+	@Bean
+	@ConditionalOnProperty("ozgcloud.file-manager.address")
+	GrpcChannelConfigurator fileManagerConfigurator() {
+		return GrpcChannelConfigurator.builder()
+			.clientName(CLIENT_NAME_FILE_MANAGER)
+			.address(fileManagerProperties.getAddress())
+			.negotiationType(fileManagerProperties.getNegotiationType())
+			.build();
+	}
+
 	@Bean
 	GrpcChannelsProperties clientProperties(Collection<GrpcChannelConfigurator> configurators) {
 		var properties = new GrpcChannelsProperties();