Raise name length error when creating migration.

Currently this error gets raised when trying to apply the migration, but
it seems better to learn about it when trying to create the migration.

aerich/migrate.py

@@ -17,7 +17,7 @@ from tortoise import (
 from tortoise.fields import Field
 
 from aerich.ddl import BaseDDL
-from aerich.models import Aerich
+from aerich.models import Aerich, MAX_VERSION_LENGTH
 from aerich.utils import get_app_connection
 
 
@@ -89,7 +89,10 @@ class Migrate:
         last_version_num = await cls._get_last_version_num()
         if last_version_num is None:
             return f"0_{now}_init.json"
-        return f"{last_version_num + 1}_{now}_{name}.json"
+        version = f"{last_version_num + 1}_{now}_{name}.json"
+        if len(version) > MAX_VERSION_LENGTH:
+            raise ValueError(f"Version name exceeds maximum length ({MAX_VERSION_LENGTH})")
+        return version
 
     @classmethod
     async def _generate_diff_sql(cls, name):