Add Memgraph integration

[katarinasupe]

Description

• To make this work, I added a new dependency: langchain-memgraph and added it to [tool.poetry.extras] graph. I didn't add changes to poetry.lock here - not sure if you prefer that or not.
• I added the initial version of Memgraph integration. Please provide feedback on where to place this integration. Specifics related to Memgraph integration - I used Memgraph's vector search with cosine similarity metrics directly (it is a built-in Memgraph feature), instead of calculating cosine similarity with Cypher. I also created indexes in the beginning to ensure better performance.
• I created an example Jupyter Notebook to test the usage.
• I updated your documentation to offer Memgraph next to Neo4j as Graph Memory. The example usage can stay the same. I didn't add TypeScript config as I am not sure how you handle TS project next to the Python one.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Please delete options that are not relevant.

• Test Script (Jupyter Notebook)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed

[CLAassistant]

All committers have signed the CLA.

[Dev-Khant]

Can you please add memgraph package in MAKEFILE so that CI tests can pass?

[Dev-Khant]

can you remove this llmas it's mentioned above again?

[katarinasupe]

I updated it to the config that works for me in the notebook. Let me know if that's okay

[katarinasupe]

Can you please add memgraph package in MAKEFILE so that CI tests can pass?

@Dev-Khant can you elaborate where exactly? Which MAKEFILE and what's needed?

[Dev-Khant]

Hey @katarinasupe You will have to add langchain-memgraph here https://github.com/mem0ai/mem0/blob/main/Makefile#L17

[Dev-Khant]

Hey @katarinasupe can you check why the tests are failing?

[katarinasupe]

Hey @katarinasupe can you check why the tests are failing?

I think it was related to poetry lock. I pushed the changes now. Let me know if that works @Dev-Khant

[Dev-Khant]

@katarinasupe Thanks for the contribution!!