Fix ConditionalOnClass

Currently, `ConditionalOnClass` check on a class in the same jar.
In order to enable this auto-configuration the check should be
against depenencies such as CloudState in
`io.cloudstate:cloud-state-javasupport`.

cloudstate-springboot-support/src/main/java/io/cloudstate/springboot/starter/autoconfigure/CloudstateAutoConfiguration.java

@@ -13,7 +13,7 @@
 import io.cloudstate.springboot.starter.internal.CloudstateEntityScan;
 
 @Configuration
-@ConditionalOnClass(CloudstateProperties.class)
+@ConditionalOnClass(CloudState.class)
 @EnableConfigurationProperties(CloudstateProperties.class)
 @ComponentScan(basePackages = "io.cloudstate.springboot.starter")
 public class CloudstateAutoConfiguration {