Move some constants to common (#11004)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

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

api/db/db_models.py

@@ -32,12 +32,13 @@ from playhouse.migrate import MySQLMigrator, PostgresqlMigrator, migrate
 from playhouse.pool import PooledMySQLDatabase, PooledPostgresqlDatabase
 
 from api import settings, utils
-from api.db import ParserType, SerializedType
+from api.db import SerializedType
 from api.utils.json_encode import json_dumps, json_loads
 from api.utils.configs import deserialize_b64, serialize_b64
 
 from common.time_utils import current_timestamp, timestamp_to_date, date_string_to_timestamp
 from common.decorator import singleton
+from common.constants import ParserType
 
 
 CONTINUOUS_FIELD_TYPE = {IntegerField, FloatField, DateTimeField}