Add support for graph memories when `agent_id` is passed

[deshraj]

🚀 The feature

Reported here: https://discord.com/channels/1121119078191480945/1219903345435738112/1382019513544998992

Motivation, pitch

Graph memories should be created for agents as well.

[parshvadaftari]

@deshraj I can pick this up. Can you assign this to me?

[Dev-Khant]

Closing this issue as it had been done.