use Azure factory for subscription client

provider/notification-azure/src/main/java/org/opengroup/osdu/notification/provider/azure/di/SubscriptionAPIConfigBean.java

+package org.opengroup.osdu.notification.provider.azure.di;
+
+import lombok.Data;
+import org.opengroup.osdu.core.common.notification.SubscriptionAPIConfig;
+import org.opengroup.osdu.notification.provider.interfaces.IAppProperties;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.config.AbstractFactoryBean;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Data
+@Component
+@ConfigurationProperties
+public class SubscriptionAPIConfigBean extends AbstractFactoryBean<SubscriptionAPIConfig> {
+
+    @Autowired
+    private IAppProperties config;
+
+    private String apiKey;
+
+    @Override
+    public Class<?> getObjectType() {
+        return SubscriptionAPIConfig.class;
+    }
+
+    @Override
+    protected SubscriptionAPIConfig createInstance() throws Exception {
+        return SubscriptionAPIConfig
+                .builder()
+                .rootUrl(config.getRegisterAPI())
+                .apiKey(apiKey)
+                .build();
+    }
+}

provider/notification-azure/src/main/java/org/opengroup/osdu/notification/provider/azure/di/SubscriptionFactoryAzure.java

+package org.opengroup.osdu.notification.provider.azure.di;
+
+import org.opengroup.osdu.core.common.http.IHttpClient;
+import org.opengroup.osdu.core.common.model.http.DpsHeaders;
+import org.opengroup.osdu.core.common.notification.ISubscriptionFactory;
+import org.opengroup.osdu.core.common.notification.ISubscriptionService;
+import org.opengroup.osdu.core.common.notification.SubscriptionAPIConfig;
+import org.opengroup.osdu.core.common.notification.SubscriptionService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+
+import java.util.Objects;
+
+@Component
+@Primary
+@ConditionalOnProperty(value = "azure.entitlements.factory.enabled", havingValue = "true", matchIfMissing = true)
+public class SubscriptionFactoryAzure implements ISubscriptionFactory {
+
+    private final SubscriptionAPIConfig config;
+    private final IHttpClient client;
+
+    @Autowired
+    public SubscriptionFactoryAzure(final SubscriptionAPIConfig subscriptionConfig, final IHttpClient httpClient) {
+        Objects.requireNonNull(subscriptionConfig, "SubscriptionAPIConfig cannot be null");
+        this.config = subscriptionConfig;
+        this.client = httpClient;
+    }
+
+    @Override
+    public ISubscriptionService create(final DpsHeaders dpsHeaders) {
+        Objects.requireNonNull(dpsHeaders, "headers cannot be null");
+        return new SubscriptionService(this.config, this.client, dpsHeaders);
+    }
+}