refactor: move API to standardized pydantic schemas across CLI, Python client, REST server (cleaned up git history) (#1659)

Co-authored-by: cpacker <packercharles@gmail.com>
Co-authored-by: matthew zhou <matthewzhou@matthews-MacBook-Pro.local>
Co-authored-by: Zack Field <field.zackery@gmail.com>
Co-authored-by: robingotz <tug29225@temple.edu>
Co-authored-by: Vandracon <vandracon@yahoo.com>
Co-authored-by: Maximilian-Winter <maximilian.winter.91@gmail.com>
Co-authored-by: Scott <scott@vysona.com>
Co-authored-by: Jonathan Ward <jonathan.ward7892@gmail.com>
Co-authored-by: madgrizzle <john@thehogans.name>
Co-authored-by: Carlo <284474102@qq.com>
Co-authored-by: Shubham Naik <shubham.naik10@gmail.com>
Co-authored-by: Robin Goetz <35136007+goetzrobin@users.noreply.github.com>

.gitignore

@@ -1012,6 +1012,7 @@ FodyWeavers.xsd
 ## cached db data
 pgdata/
 !pgdata/.gitkeep
+.persist/
 
 ## pytest mirrors
 memgpt/.pytest_cache/