Feat/dataset service api (#1245)

Co-authored-by: jyong <jyong@dify.ai>
Co-authored-by: StyleZhang <jasonapring2015@outlook.com>

api/fields/file_fields.py

@@ -0,0 +1,18 @@
+from flask_restful import fields
+
+from libs.helper import TimestampField
+
+upload_config_fields = {
+    'file_size_limit': fields.Integer,
+    'batch_count_limit': fields.Integer
+}
+
+file_fields = {
+    'id': fields.String,
+    'name': fields.String,
+    'size': fields.Integer,
+    'extension': fields.String,
+    'mime_type': fields.String,
+    'created_by': fields.String,
+    'created_at': TimestampField,
+}