feat: [discord] community manager greet + timeout user

[tcm390]

sub pr: #4063

Summary
This PR enables Discord community manager to automatically greet users when a new user joins. It also adds a new action that allows agents to timeout users

TODO
In a future PR, we could allow agents to use a custom greeting prompt from metadata, so agent can have different greeting message.

We should adapt this behavior to support other platforms, like Telegram.

Notes
I updated recentMessages to include the full entity ID so we can retrieve the target Discord username for the timeout action. Let me know if this is acceptable or if we should trim it down.

result:

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