expose condition api (Azure#26316)

Author: XiaofeiCao

sdk/resourcemanager/azure-resourcemanager-authorization/src/main/java/com/azure/resourcemanager/authorization/implementation/RoleAssignmentImpl.java

@@ -141,6 +141,11 @@ public String principalId() {
         return innerModel().principalId();
     }
 
+    @Override
+    public String condition() {
+        return innerModel().condition();
+    }
+
     @Override
     public RoleAssignmentImpl forObjectId(String objectId) {
         this.objectId = objectId;

sdk/resourcemanager/azure-resourcemanager-authorization/src/main/java/com/azure/resourcemanager/authorization/models/RoleAssignment.java

@@ -28,6 +28,9 @@ public interface RoleAssignment
     /** @return the principal ID */
     String principalId();
 
+    /** @return the condition */
+    String condition();
+
     /**************************************************************
      * Fluent interfaces to provision an role assignment
      **************************************************************/