feat: add models and partially custom error messages

itd/models/comment.py

@@ -1,12 +1,9 @@
-from uuid import UUID
-from datetime import datetime
-
 from pydantic import Field
 
-from itd.models._text import _TextObject
+from itd.models._text import TextObject
 
 
-class CommentShort(_TextObject):
+class CommentShort(TextObject):
     likes_count: int = Field(0, alias='likesCount')
     replies_count: int = Field(0, alias='repliesCount')
     is_liked: bool = Field(False, alias='isLiked')