Move api.settings to common.settings (#11036)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

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Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/apps/__init__.py

@@ -33,7 +33,7 @@ from api.utils import commands
 from flask_mail import Mail
 from flask_session import Session
 from flask_login import LoginManager
-from api import settings
+from common import settings
 from api.utils.api_utils import server_error_response
 from api.constants import API_VERSION