Add api for list agents and agent seesions (#3835)

### What problem does this PR solve?

Add api for list agents and agent seesions

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

api/apps/sdk/agent.py

@@ -0,0 +1,39 @@
+#
+#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+from api.db.services.canvas_service import CanvasTemplateService, UserCanvasService
+from api.utils.api_utils import get_error_data_result, token_required
+from api.utils.api_utils import get_result
+from flask import request
+
+@manager.route('/agents', methods=['GET'])
+@token_required
+def list_agents(tenant_id):
+    id = request.args.get("id")
+    title = request.args.get("title")
+    if id or title:
+        canvas = UserCanvasService.query(id=id, title=title, user_id=tenant_id)
+        if not canvas:
+            return get_error_data_result("The agent doesn't exist.")
+    page_number = int(request.args.get("page", 1))
+    items_per_page = int(request.args.get("page_size", 30))
+    orderby = request.args.get("orderby", "update_time")
+    if request.args.get("desc") == "False" or request.args.get("desc") == "false":
+        desc = False
+    else:
+        desc = True
+    canvas = UserCanvasService.get_list(tenant_id,page_number,items_per_page,orderby,desc,id,title)
+    return get_result(data=canvas)