[type:feat] add shenyu gateway namespace

shenyu-bootstrap/src/main/resources/application.yml

@@ -80,6 +80,7 @@ management:
           - 'health'
           - 'info'
 shenyu:
+  namespace: "649330b6-c2d7-4edc-be8e-8a54df9eb385"
   selectorMatchCache:
     ## selector L1 cache
     cache:

shenyu-common/src/main/java/org/apache/shenyu/common/config/ShenyuConfig.java

@@ -71,6 +71,26 @@ public class ShenyuConfig {
 
     private AlertConfig alert = new AlertConfig();
 
+    private String namespace = Constants.SYS_DEFAULT_NAMESPACE_ID;
+
+    /**
+     * shenyu bootstrap namespace.
+     *
+     * @return namespace id
+     */
+    public String getNamespace() {
+        return namespace;
+    }
+
+    /**
+     * Set shenyu bootstrap namespace, default value is {@link org.apache.shenyu.common.constant.Constants#SYS_DEFAULT_NAMESPACE_ID}.
+     *
+     * @param namespace namespace id
+     */
+    public void setNamespace(final String namespace) {
+        this.namespace = namespace;
+    }
+
     /**
      * Gets health.
      *

shenyu-common/src/main/java/org/apache/shenyu/common/constant/Constants.java

@@ -835,6 +835,11 @@ public interface Constants {
      */
     String METRICS_HYSTRIX = "metricsHystrix";
 
+    /**
+     * The constant shenyu namespace id.
+     */
+    String SHENYU_NAMESPACE_ID = "namespaceId";
+
     /**
      * The constant SYS_DEFAULT_NAMESPACE_ID.
      */