Feat: Alter flask to Quart for async API serving. (#11275)

### What problem does this PR solve?

#11277

### Type of change

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

api/apps/api_app.py

@@ -14,20 +14,20 @@
 #  limitations under the License.
 #
 from datetime import datetime, timedelta
-from flask import request
-from flask_login import login_required, current_user
+from quart import request
 from api.db.db_models import APIToken
 from api.db.services.api_service import APITokenService, API4ConversationService
 from api.db.services.user_service import UserTenantService
 from api.utils.api_utils import server_error_response, get_data_error_result, get_json_result, validate_request, \
     generate_confirmation_token
 from common.time_utils import current_timestamp, datetime_format
+from api.apps import login_required, current_user
 
 
 @manager.route('/new_token', methods=['POST'])  # noqa: F821
 @login_required
-def new_token():
-    req = request.json
+async def new_token():
+    req = await request.json
     try:
         tenants = UserTenantService.query(user_id=current_user.id)
         if not tenants:
@@ -72,8 +72,8 @@ def token_list():
 @manager.route('/rm', methods=['POST'])  # noqa: F821
 @validate_request("tokens", "tenant_id")
 @login_required
-def rm():
-    req = request.json
+async def rm():
+    req = await request.json
     try:
         for token in req["tokens"]:
             APITokenService.filter_delete(