feat: add proto definition about trigger create (#241)

* feat: add trigger create

* chore: unified naming style

* chore: rename some fields

* chore: make all

Author: fengys1996

c++/greptime/v1/ddl.pb.cc

@@ -286,3 +286,34 @@ message SetDatabaseOptions {
 message UnsetDatabaseOptions {
     repeated string keys = 1;
 }
+
+// The create trigger expression.
+message CreateTriggerExpr {
+    string catalog_name = 1;
+    string trigger_name = 2;
+    bool create_if_not_exists = 3;
+    // The SQL statement to be executed periodically.
+    string sql = 4;
+    // The channels for sending notifications.
+    repeated NotifyChannel channels = 5;
+    // The user-defined labels.
+    map<string, string> labels = 6;
+    // The user-defined annotations.
+    map<string, string> annotations = 7;
+    // The execution interval for sql query in seconds.
+    uint64 interval = 8;
+}
+
+// The notification channel for trigger.
+message NotifyChannel {
+    string name = 1;
+    oneof channel_type {
+        WebhookOptions webhook = 2;
+    }
+}
+
+// The options for webhook.
+message WebhookOptions {
+    string url = 1;
+    map<string, string> opts = 2;
+}

c++/greptime/v1/ddl.pb.h

@@ -84,6 +84,10 @@ message AlterDatabaseTask {
     AlterDatabaseExpr task = 1;
 }
 
+message CreateTriggerTask {
+    CreateTriggerExpr create_trigger = 1;
+}
+
 message DdlTaskRequest {
     RequestHeader header = 1;
     QueryContext query_context = 64;
@@ -103,6 +107,7 @@ message DdlTaskRequest {
         CreateViewTask create_view_task = 13;
         DropViewTask drop_view_task = 14;
         AlterDatabaseTask alter_database_task = 15;
+        CreateTriggerTask create_trigger_task = 16;
      }
 }