Refactor event payload handling across adapters

- Introduced `event-payload` crate to centralize event payload definitions.
- Updated NATS and PostgreSQL adapters to use the new `EventPayload` type.
- Removed redundant event payload definitions and conversion implementations from NATS and PostgreSQL adapters.
- Simplified SQLite event queue to utilize the new `EventPayload`.
- Refactored wiring functions for PostgreSQL and SQLite to improve database connection handling and migration.
- Cleaned up presentation and worker crates by removing unused event publisher dependencies and related wiring functions.

crates/worker/Cargo.toml

@@ -15,7 +15,6 @@ postgres-federation = ["postgres", "dep:postgres-federation", "dep:activitypub",
 [dependencies]
 domain = { workspace = true }
 application = { workspace = true }
-event-publisher = { workspace = true }
 tokio = { workspace = true }
 anyhow = { workspace = true }
 thiserror = { workspace = true }