refactor!: Migrate users + agent information into storage connectors

[sarahwooders]

Please describe the purpose of this pull request.

• Refactor Config to User record
• Refactor AgentConfig to AgentState record
• Refactor Agent init and save to use AgentState

---

Todos

• Add user_id field to commands (default to config.anon_clientid if not provided)
  • Data loading (cli_load.py)
  • Configuration (cli_configure.py)
    • Create row in User table if config.anon_clientid does not exist
  • MemGPT run (cli.py)
    • Lookup agents from metadata store, and insert new AgentState objects if new one is created
  • Metadata listing (e.g. listing sources, agents, etc.)
• Migrate all references to StorageConnector to pass in user_id, and optionally agent_id (if recall/archival memory)
• Check that run and configure work
• Ensure tests are all working
• Update tests to use new metadata store + storage connectors

Remaining todos:

• Adapt record.text to be record.content, which can be a List of strings.
• Update all instances of create_agent_from_preset to use correct format
• Remove all references of AgentConfig and replace them with AgentState, which can be looked up from the metadata store

---

How to test

• Regression test (unit tests should cover)
• Make sure that persistence manager is persisting (manual DB inspection and/or save+load)

Have you tested this PR?

WIP