Support Direct Import in the open source lib

[liu1700]

🚀 The feature

Bypass the memory deduction phase and directly store pre-defined memories for efficient retrieval
Exactly same as https://docs.mem0.ai/features/direct-import
But in the open source lib

Motivation, pitch

I'm working on an ai agent project using the open source lib with self-hosted server and database, and I'd like direct import also available in the Open sourced lib.
I can submit a PR for it.