[feat]: Event Sync for nostr-rs-relay in StartOS

[k0gen]

Prerequisites

• I have searched for existing issues that already suggest this feature.

Describe the Feature Request

Add a function in the actions section of the nostr-rs-relay service that allows users to sync their events from popular nostr relays to their personal StartOS relay.

Describe the Use Case

This feature is useful for users who want to maintain a personal backup of their nostr data. It solves the problem of data sovereignty and accessibility by allowing users to easily keep a copy of their nostr events on their own infrastructure without manual intervention.

Describe Preferred Solution

• Add a new action in the nostr-rs-relay service interface.
• Allow users to input their npub (public key).
• Provide a list of popular nostr relays to choose from.
• Implement a mechanism to fetch and copy events associated with the user's npub from selected relays to their personal StartOS relay.

Describe Alternatives

No response

Anything else?

Reference implementation: https://github.com/Hubmakerlabs/replicatr/tree/main/cmd/ingestr