feat: orm passage migration (#2180)

Co-authored-by: Mindy Long <mindy@letta.com>

letta/orm/__init__.py

@@ -6,6 +6,7 @@ from letta.orm.file import FileMetadata
 from letta.orm.job import Job
 from letta.orm.message import Message
 from letta.orm.organization import Organization
+from letta.orm.passage import Passage
 from letta.orm.sandbox_config import SandboxConfig, SandboxEnvironmentVariable
 from letta.orm.source import Source
 from letta.orm.tool import Tool